EIGRP

Question 1

What does EIGRP stand for?
A) Enhanced Interior Gateway Routing Protocol
B) Extended Interior Gateway Routing Protocol
C) Enhanced Internet Gateway Routing Protocol
D) Exterior Interior Gateway Routing Protocol

Answer 1

Answer: A

Question 2

Which protocol number does EIGRP use for IP communication?
A) 6
B) 17
C) 88
D) 89

Answer 2

Answer: C

Question 3

What type of routing protocol is EIGRP?
A) Distance Vector
B) Link-State
C) Advanced Distance Vector (Hybrid)
D) Path Vector

Answer 3

Answer: C

Question 4

Which algorithm does EIGRP use to calculate the best path?
A) Dijkstra
B) Bellman-Ford
C) DUAL (Diffusing Update Algorithm)
D) SPF

Answer 4

Answer: C

Question 5

What is the default administrative distance of EIGRP?
A) 90
B) 100
C) 110
D) 120

Answer 5

Answer: A

Question 6

Which multicast address does EIGRP use for updates?
A) 224.0.0.5
B) 224.0.0.6
C) 224.0.0.9
D) 224.0.0.10

Answer 6

Answer: D

Question 7

Which of the following is NOT a EIGRP packet type?
A) Hello
B) Query
C) LSA
D) Reply

Answer 7

Answer: C

Question 8

What is the purpose of the EIGRP Hello packet?
A) To send routing updates
B) To establish and maintain neighbor relationships
C) To request full routing tables
D) To acknowledge received packets

Answer 8

Answer: B

Question 9

What is the default Hello interval for EIGRP on high-speed links (>1.544 Mbps)?
A) 5 seconds
B) 10 seconds
C) 30 seconds
D) 60 seconds

Answer 9

Answer: A

Question 10

What is the default Hold Time for EIGRP on high-speed links?
A) 5 seconds
B) 15 seconds
C) 30 seconds
D) 60 seconds

Answer 10

Answer: B

Question 11

Which of the following must match for two routers to become EIGRP neighbors?
A) IP Address
B) AS Number
C) K-values
D) All of the above

Answer 11

Answer: D

Question 12

What command enables EIGRP on a Cisco router with AS 100?
A) router eigrp 100
B) eigrp enable 100
C) enable eigrp 100
D) routing eigrp 100

Answer 12

Answer: A

Question 13

Which command shows EIGRP neighbor relationships?
A) show ip eigrp interfaces
B) show ip eigrp neighbors
C) show eigrp topology
D) show ip route eigrp

Answer 13

Answer: B

Question 14

What is the EIGRP topology table used for?
A) Stores all learned routes
B) Stores only the best routes
C) Stores neighbor information
D) Stores OSPF LSAs

Answer 14

Answer: A

Question 15

Which command displays the EIGRP topology table?
A) show ip eigrp topology
B) show eigrp database
C) show ip route eigrp
D) show eigrp neighbors

Answer 15

Answer: A

Question 16

What is the Feasible Distance (FD) in EIGRP?
A) The metric to reach a destination
B) The best metric known to reach a destination
C) The metric advertised by a neighbor
D) The administrative distance

Answer 16

Answer: B

Question 17

What is the Advertised Distance (AD) in EIGRP?
A) The metric from the neighbor to the destination
B) The total metric to reach the destination
C) The administrative distance
D) The hop count

Answer 17

Answer: A

Question 18

What is a Feasible Successor (FS) in EIGRP?
A) A backup route with AD less than FD
B) The primary route
C) A route with the lowest metric
D) A static route

Answer 18

Answer: A

Question 19

What is the formula for EIGRP metric calculation?
A) Bandwidth + Delay
B) (Bandwidth + Delay) * 256
C) 256 * (Bandwidth + Delay)
D) (K1 * Bandwidth) + (K2 * Bandwidth) / (256 - Load) + (K3 * Delay)

Answer 19

Answer: D

Question 20

Which K-values are enabled by default in EIGRP?
A) K1 and K2
B) K1 and K3
C) K3 and K4
D) K2 and K5

Answer 20

Answer: B

Question 21

Which command advertises network 192.168.1.0/24 in EIGRP?
A) network 192.168.1.0
B) network 192.168.1.0 255.255.255.0
C) network 192.168.1.0 0.0.0.255
D) network 192.168.1.0/24

Answer 21

Answer: C

Question 22

Which command disables auto-summarization in EIGRP?
A) no auto-summary
B) no summary
C) disable auto-summary
D) auto-summary off

Answer 22

Answer: A

Question 23

What is the purpose of the passive-interface command in EIGRP?
A) Prevents sending Hello packets on an interface
B) Disables EIGRP on an interface
C) Reduces CPU usage
D) Both A and B

Answer 23

Answer: D

Question 24

Which command sets the EIGRP Hello timer to 10 seconds?
A) ip hello-interval eigrp 100 10
B) eigrp hello-interval 10
C) ip eigrp hello-interval 10
D) hello-interval eigrp 100 10

Answer 24

Answer: A

Question 25

Which command changes the EIGRP Hold timer to 30 seconds? A) ip hold-time eigrp 100 30 B) hold-time eigrp 100 30 C) ip eigrp hold-time 30 D) eigrp hold-time 30

Answer 25

Answer: A

Question 26

Which command shows EIGRP traffic statistics? A) show ip eigrp traffic B) show eigrp packets C) show ip eigrp events D) show eigrp statistics

Answer 26

Answer: A

Question 27

Which command displays EIGRP interfaces? A) show ip eigrp interfaces B) show eigrp interfaces C) show ip interfaces eigrp D) show interfaces eigrp

Answer 27

Answer: A

Question 28

What does the variance command do in EIGRP? A) Adjusts the EIGRP metric B) Enables unequal-cost load balancing C) Changes the Hello interval D) Modifies the K-values

Answer 28

Answer: B

Question 29

Which command enables EIGRP authentication? A) ip authentication mode eigrp B) ip eigrp authentication C) authentication eigrp D) ip eigrp authentication mode

Answer 29

Answer: A

Question 30

Which authentication type does EIGRP support? A) MD5 B) SHA-1 C) AES D) Both A and B

Answer 30

Answer: A

Question 31

Which two metrics are used by default in EIGRP’s composite metric calculation? A) Bandwidth & Load B) Bandwidth & Delay C) Delay & Reliability D) Load & MTU

Answer 31

Answer: B

Question 32

How does EIGRP calculate bandwidth in its metric? A) Uses the slowest link in the path (in kilobits/sec) B) Uses the fastest link in the path (in megabits/sec) C) Uses an average of all link speeds D) Uses the configured bandwidth on the outgoing interface

Answer 32

Answer: A

Question 33

What is the default reference bandwidth used in EIGRP metric calculation? A) 1 Mbps B) 10 Mbps C) 100 Mbps D) 1 Gbps

Answer 33

Answer: C (EIGRP uses the slowest link’s bandwidth in the path, scaled by 10^7)

Question 34

How is delay represented in EIGRP’s metric calculation? A) Milliseconds B) Microseconds C) Tens of microseconds D) Seconds

Answer 34

Answer: C (Delay is in tens of microseconds, e.g., 1000 = 100 microseconds)

Question 35

Which command shows the detailed EIGRP metric for a route? A) show ip route eigrp B) show ip eigrp topology C) show ip eigrp topology D) show eigrp route details

Answer 35

Answer: C

Question 36

What is the formula for EIGRP’s composite metric? A) Metric = 256 × (K1 × Bandwidth + K2 × Bandwidth / (256 – Load) + K3 × Delay) B) Metric = (K1 × Bandwidth) + (K3 × Delay) C) Metric = Bandwidth + Delay D) Metric = 256 × (Bandwidth + Delay)

Answer 36

Answer: A

Question 37

How can you influence EIGRP path selection? A) Adjust the bandwidth value on an interface B) Adjust the delay value on an interface C) Use route filtering D) All of the above

Answer 37

Answer: D

Question 38

What happens if you set bandwidth to 1000 (Kbps) on a Gigabit interface in EIGRP? A) The router ignores it and uses the real bandwidth B) EIGRP uses 1000 Kbps in metric calculation C) The interface drops all EIGRP packets D) The router disables EIGRP on that interface

Answer 38

Answer: B

Question 39

Which command modifies the delay value on an interface? A) delay B) ip delay C) eigrp delay D) bandwidth-delay

Answer 39

Answer: A

Question 40

What is the purpose of the variance command in EIGRP? A) To adjust the administrative distance B) To enable unequal-cost load balancing C) To change the K-values D) To modify the Hello timer

Answer 40

Answer: B

Question 41

What does the EIGRP topology table store? A) Only the best routes B) All learned routes, including feasible successors C) Only OSPF routes D) Static routes

Answer 41

Answer: B

Question 42

What is a "stuck in active" (SIA) state in EIGRP? A) A neighbor that is not responding to queries B) A route that is not being used C) A router that is overloaded D) A loop in the network

Answer 42

Answer: A

Question 43

How does EIGRP recover from a "stuck in active" route? A) Resets the neighbor relationship B) Sends a query to all neighbors C) Flushes the route from the topology table D) Ignores the route

Answer 43

Answer: A

Question 44

Which command displays the EIGRP topology table? A) show ip eigrp topology B) show eigrp database C) show ip route eigrp D) show eigrp neighbors

Answer 44

Answer: A

Question 45

What does the "P" (Passive) state in show ip eigrp topology indicate? A) The route is unstable B) The route is stable and usable C) The route is being queried D) The route is a backup path

Answer 45

Answer: B

Question 46

What does the "A" (Active) state in show ip eigrp topology indicate? A) The route is stable B) The route is being recalculated C) The route is a backup path D) The route is invalid

Answer 46

Answer: B

Question 47

What is the purpose of the "successor" in EIGRP? A) A backup route B) The primary best path C) A static route D) A default route Answer: B

Answer 47

Answer: B

Question 48

What is the purpose of the "feasible successor" in EIGRP? A) A backup route that meets the feasibility condition B) The primary best path C) A static route D) A default route

Answer 48

Answer: A

Question 49

What is the "feasibility condition" in EIGRP? A) AD of a backup route must be less than the FD of the successor B) AD of a backup route must be greater than the FD of the successor C) The route must have the lowest metric D) The route must be manually configured

Answer 49

Answer: A

Question 50

Which command shows EIGRP’s feasible successors? A) show ip eigrp topology B) show ip eigrp neighbors C) show ip route eigrp D) show ip eigrp interfaces

Answer 50

Answer: A

Question 51

What is the default number of equal-cost paths EIGRP allows in the routing table? A) 1 B) 2 C) 4 D) 8

Answer 51

Answer: C

Question 52

How can you enable unequal-cost load balancing in EIGRP? A) Using the maximum-paths command B) Using the variance command C) Using the traffic-share command D) Using the load-balance command

Answer 52

Answer: B

Question 53

What does a variance of 2 mean in EIGRP? A) Allows routes with a metric up to 2 times worse than the best route B) Allows only 2 equal-cost paths C) Adjusts the administrative distance to 2 D) Changes the K-values

Answer 53

Answer: A

Question 54

Which command limits the number of EIGRP paths in the routing table? A) maximum-paths B) variance C) load-balance D) traffic-share

Answer 54

Answer: A

Question 55

Which command adjusts how traffic is distributed across multiple paths? A) traffic-share balanced B) load-balance variance C) maximum-paths D) bandwidth

Answer 55

Answer: A

Question 56

What happens if you set variance 1 in EIGRP? A) Only equal-cost load balancing is allowed B) Unequal-cost load balancing is disabled C) The router ignores all backup routes D) The router resets EIGRP neighbors

Answer 56

Answer: A

Question 57

Which command verifies load balancing in EIGRP? A) show ip route B) show ip eigrp topology C) show ip eigrp traffic D) show ip protocols

Answer 57

Answer: A

Question 58

What is the purpose of the delay command in EIGRP? A) Adjusts interface delay for metric calculation B) Changes the Hello timer C) Enables authentication D) Disables load balancing

Answer 58

Answer: A

Question 59

How does modifying bandwidth on an interface affect EIGRP? A) Changes the metric calculation B) Changes the Hello timer C) Disables EIGRP on that interface D) Enables authentication

Answer 59

Answer: A

Question 60

Which command forces EIGRP to use a specific path by adjusting metrics? A) offset-list B) distribute-list C) route-map D) variance

Answer 60

Answer: A

Question 61

Which authentication method does EIGRP support? A) Plaintext B) MD5 C) SHA-256 D) IPsec

Answer 61

Answer: B

Question 62

What command enables MD5 authentication for EIGRP? A) ip authentication mode eigrp md5 B) ip eigrp authentication md5 C) eigrp authentication md5 D) authentication md5 eigrp

Answer 62

Answer: A

Question 63

Where is EIGRP authentication configured? A) Global configuration mode B) Interface configuration mode C) Router EIGRP configuration mode D) RIP configuration mode

Answer 63

Answer: B

Question 64

What command assigns a key-chain to EIGRP authentication? A) ip authentication key-chain eigrp B) eigrp key-chain C) ip eigrp authentication key-chain D) authentication key-chain eigrp

Answer 64

Answer: A

Question 65

What is the purpose of a key-chain in EIGRP authentication? A) Defines multiple passwords with time-based validity B) Encrypts all EIGRP packets C) Disables authentication D) Changes the Hello interval

Answer 65

Answer: A

Question 66

Which command creates a key-chain for EIGRP authentication? A) key-chain B) ip key-chain C) eigrp key-chain D) authentication key-chain

Answer 66

Answer: A

Question 67

What happens if EIGRP authentication fails? A) Neighbors form but routes are not exchanged B) Neighbor adjacency is not established C) EIGRP switches to plaintext authentication D) The router reboots

Answer 67

Answer: B

Question 68

Which command verifies EIGRP authentication? A) show ip eigrp interfaces B) debug eigrp packets C) show key-chain D) All of the above

Answer 68

Answer: D

Question 69

Can EIGRP authenticate with different key-strings on neighbors? A) Yes, if the key-chain names match B) No, keys must match exactly C) Only if K-values are different D) Only in passive mode

Answer 69

Answer: B

Question 70

What is the default behavior if no authentication is configured? A) EIGRP refuses neighbor relationships B) EIGRP works without authentication C) EIGRP uses plaintext passwords D) EIGRP disables itself

Answer 70

Answer: B

Question 71

What command manually summarizes EIGRP routes at an interface? A) ip summary-address eigrp B) summary-address eigrp C) eigrp summary D) ip eigrp summary

Answer 71

Answer: A

Question 72

What is the purpose of EIGRP auto-summarization? A) Summarizes routes at classful boundaries B) Disables summarization C) Filters routes D) Enables authentication

Answer 72

Answer: A

Question 73

How do you disable auto-summarization in EIGRP? A) no auto-summary B) disable auto-summary C) no summary D) auto-summary off

Answer 73

Answer: A

Question 74

What is a disadvantage of manual summarization? A) Suboptimal routing if not carefully planned B) Increases routing table size C) Disables load balancing D) Breaks neighbor relationships

Answer 74

Answer: A

Question 75

Which command filters routes in EIGRP? A) distribute-list B) access-list C) prefix-list D) All of the above

Answer 75

Answer: D

Question 76

What does the distribute-list command do in EIGRP? A) Filters inbound/outbound routes B) Modifies metrics C) Enables authentication D) Changes Hello timers

Answer 76

Answer: A

Question 77

Which command blocks EIGRP updates from being sent out an interface? A) passive-interface B) distribute-list out C) no eigrp update D) filter-interface

Answer 77

Answer: A

Question 78

What is the "null0" summary route in EIGRP? A) A loop-prevention mechanism for summarized routes B) A default route C) A backup route D) A static route

Answer 78

Answer: A

Question 79

How does EIGRP handle a summarized route that matches no subnets? A) It still advertises the summary with a null0 route B) It disables summarization C) It sends all subnets instead D) It ignores the summary

Answer 79

Answer: A

Question 80

What happens if a summarized route includes non-contiguous subnets? A) Traffic may be blackholed B) EIGRP disables summarization C) The router crashes D) Neighbors reset

Answer 80

Answer: A

Question 81

Which command shows why an EIGRP neighbor failed to form? A) debug eigrp packets B) show ip eigrp neighbors C) show ip protocols D) All of the above

Answer 81

Answer: D

Question 82

What is the most common reason for EIGRP neighbor flapping? A) Mismatched AS numbers B) Mismatched K-values C) Authentication failure D) All of the above

Answer 82

Answer: D

Question 83

Which command resets EIGRP neighbor relationships? A) clear ip eigrp neighbors B) reset eigrp neighbors C) reload eigrp D) eigrp restart

Answer 83

Answer: A

Question 84

What does a "%DUAL-5-NBRCHANGE" syslog message indicate? A) A neighbor adjacency changed state B) A route was deleted C) Authentication failed D) A query was sent

Answer 84

Answer: A

Question 85

How do you verify EIGRP K-values? A) show ip protocols B) show ip eigrp topology C) show ip eigrp interfaces D) show run | section eigrp

Answer 85

Answer: A

Question 86

What does a high "Q Cnt" in show ip eigrp neighbors indicate? A) Many queries are pending (possible SIA issue) B) The neighbor is stable C) Authentication is working D) Load balancing is active

Answer 86

Answer: A

Question 87

What is the most likely cause if EIGRP routes are missing from the routing table? A) Route filtering B) Passive interface C) Mismatched AS numbers D) All of the above

Answer 87

Answer: D

Question 88

Which command helps diagnose EIGRP packet loss? A) debug eigrp packets B) show ip eigrp traffic C) ping between neighbors D) All of the above

Answer 88

Answer: D

Question 89

What does a "Stuck in Active" (SIA) error mean? A) A query was not replied to within the active timer B) A neighbor is down C) Authentication failed D) The route is stable

Answer 89

Answer: A

Question 90

ow do you fix a "Stuck in Active" issue? A) Increase the active-time timer B) Check for network congestion C) Verify neighbor connectivity D) All of the above

Answer 90

Answer: D

Question 91

What multicast address does EIGRPv6 use? A) FF02::A B) FF02::5 C) FF02::6 D) FF02::10

Answer 91

Answer: A

Question 92

Which command enables EIGRP for IPv6? A) ipv6 router eigrp 100 B) ipv6 eigrp 100 C) router eigrp ipv6 100 D) eigrp ipv6 100

Answer 92

Answer: A

Question 93

How is the router ID determined in EIGRPv6? A) Automatically from IPv6 address B) Must be manually configured C) Uses the highest IPv4 address (like OSPFv3) D) Randomly generated

Answer 93

Answer: C

Question 94

Which command shows EIGRPv6 neighbors? A) show ipv6 eigrp neighbors B) show eigrp ipv6 neighbors C) show ipv6 protocols eigrp D) show ipv6 route eigrp

Answer 94

Answer: A

Question 95

What is the administrative distance of EIGRPv6? A) 90 B) 100 C) 110 D) 120

Answer 95

Answer: A (Same as IPv4 EIGRP)

Question 96

What is the main advantage of Named EIGRP? A) Supports both IPv4 and IPv6 under one process B) Uses less memory C) Faster convergence D) No neighbor configuration needed

Answer 96

Answer: A

Question 97

Which mode is used to configure address families in Named EIGRP? A) address-family ipv4 B) af-interface C) topology base D) All of the above

Answer 97

Answer: D

Question 98

Where are interfaces enabled in Named EIGRP? A) Under router eigrp B) Under address-family C) Under af-interface D) Under topology

Answer 98

Answer: C

Question 99

Which command enables Named EIGRP? A) router eigrp NAME B) eigrp named NAME C) named eigrp NAME D) router named-eigrp NAME

Answer 99

Answer: A

Question 100

How do you verify Named EIGRP configuration? A) show eigrp address-family B) show running-config | section eigrp C) show ip eigrp topology D) All of the above

Answer 100

Answer: D

Question 101

What is the purpose of EIGRP stub routing? A) Limits query propagation B) Reduces memory usage C) Improves convergence D) All of the above

Answer 101

Answer: D

Question 102

Which command configures a router as an EIGRP stub? A) eigrp stub B) eigrp stub connected C) stub eigrp D) ip eigrp stub

Answer 102

Answer: A

Question 103

What routes does a stub router advertise by default? A) Connected routes B) Summary routes C) Static routes D) None

Answer 103

Answer: A

Question 104

Which option allows a stub router to advertise static routes? A) eigrp stub static B) eigrp stub receive-only C) stub static D) ip eigrp stub static

Answer 104

Answer: A

Question 105

What happens if a non-stub router queries a stub router? A) Stub router replies with "inaccessible" B) Stub router ignores the query C) Stub router resets the neighbor D) Stub router forwards the query

Answer 105

Answer: A

Question 106

What is route leaking in EIGRP? A) Advertising specific routes from one EIGRP AS to another B) A security vulnerability C) Duplicating routes D) None of the above

Answer 106

Answer: A

Question 107

Which command redistributes OSPF into EIGRP? A) redistribute ospf 1 B) redistribute ospf 1 metric 10000 100 255 1 1500 C) redistribute ospf 1 eigrp 100 D) redistribute eigrp 100 ospf 1

Answer 107

Answer: B

Question 108

What is the purpose of the offset-list command? A) Modifies the EIGRP metric B) Changes the administrative distance C) Adjusts the Hello timer D) Filters routes

Answer 108

Answer: A

Question 109

How does EIGRP handle split horizon? A) Enabled by default on all interfaces B) Disabled by default on serial interfaces C) Disabled by default on hub-and-spoke Frame Relay D) Both B and C

Answer 109

Answer: D

Question 110

What command disables split horizon? A) no ip split-horizon B) no ip split-horizon eigrp 100 C) no split-horizon D) disable split-horizon

Answer 110

Answer: B

Question 111

What does a "DUAL-3-SIA" message indicate? A) Stuck In Active route B) Neighbor down C) Authentication failure D) Route filtering issue

Answer 111

Answer: A

Question 112

Which command helps diagnose SIA routes? A) debug eigrp packets B) show ip eigrp topology active C) show ip eigrp events D) All of the above

Answer 112

Answer: D

Question 113

What is the default active timer in EIGRP? A) 3 minutes B) 5 minutes C) 10 minutes D) 30 seconds

Answer 113

Answer: A

Question 114

How do you change the active timer? A) timers active-time 2 B) active-timer 120 C) ip eigrp active-time 120 D) eigrp timers active 2

Answer 114

Answer: A

Question 115

hat causes "EIGRP-4-NHREG" errors? A) No route to next-hop B) Authentication failure C) MTU mismatch D) K-value mismatch

Answer 115

Answer: A

Question 116

What is the recommended way to summarize EIGRP routes? A) At distribution layer routers B) On all interfaces C) Only on core routers D) Never summarize

Answer 116

Answer: A

Question 117

Why should you use EIGRP stub routers in branch offices? A) Limits unnecessary queries B) Reduces memory usage C) Improves stability D) All of the above

Answer 117

Answer: D

Question 118

What is the recommended Hello timer for WAN links? A) 5 seconds B) 10 seconds C) 60 seconds D) Depends on link type

Answer 118

Answer: C (Default is 60s for slow links)

Question 119

When should you adjust EIGRP metrics? A) To prefer specific paths B) When default metrics cause suboptimal routing C) For traffic engineering D) All of the above

Answer 119

Answer: D

Question 120

What is the most secure EIGRP authentication method? A) Plaintext B) MD5 C) SHA D) IPsec

Answer 120

Answer: B (Only MD5 is supported in classic EIGRP)

Question 121

Which protocol converges faster after a topology change? A) EIGRP (uses DUAL) B) OSPF (uses SPF) C) Both converge at the same speed D) Depends on network size

Answer 121

Answer: A

Question 122

What metric does OSPF use that EIGRP doesn't? A) Cost (based solely on bandwidth) B) Delay C) Reliability D) Load

Answer 122

Answer: A

Question 123

Which protocol supports unequal-cost load balancing natively? A) EIGRP B) OSPF C) Both D) Neither

Answer 123

Answer: A

Question 124

Which protocol requires hierarchical area design? A) EIGRP B) OSPF C) Both D) Neither

Answer 124

Answer: B

Question 125

Which protocol is more CPU-intensive? A) EIGRP (DUAL calculations) B) OSPF (SPF runs) C) Both are equal D) Neither uses CPU

Answer 125

Answer: B

Question 126

Which protocol is Cisco-proprietary? A) EIGRP B) OSPF C) Both D) Neither

Answer 126

Answer: A

Question 127

Which protocol uses less bandwidth for updates? A) EIGRP (incremental updates) B) OSPF (full LSA floods) C) Both are equal D) Neither uses bandwidth

Answer 127

Answer: A

Question 128

Which protocol supports manual summarization anywhere? A) EIGRP B) OSPF (only at ABRs/ASBRs) C) Both D) Neither

Answer 128

Answer: A

Question 129

Which protocol uses multicast for updates? A) EIGRP (224.0.0.10) B) OSPF (224.0.0.5/6) C) Both D) Neither

Answer 129

Answer: C

Question 130

Which protocol is better for large, stable networks? A) EIGRP (scales well with DUAL) B) OSPF (better for multi-vendor) C) Both are equal D) Neither scales

Answer 130

Answer: B

Question 131

What is EIGRP Wide Metrics? A) Supports higher bandwidth links (e.g., 100Gbps+) B) A type of authentication C) A stub feature D) IPv6-only enhancement

Answer 131

Answer: A

Question 132

Which command enables Wide Metrics? A) metric weights 0 1 0 1 0 0 B) metric version 64bit C) eigrp wide-metrics D) Not configurable (auto-detected)

Answer 132

Answer: B

Question 133

What is EIGRP Add-Path? A) Advertises multiple paths for load balancing B) A security feature C) A summarization technique D) IPv6 enhancement

Answer 133

Answer: A

Question 134

Which EIGRP feature reduces query scope? A) Stub routing B) Route summarization C) Both D) Neither

Answer 134

Answer: C

Question 135

What does EIGRP "Graceful Shutdown" do? A) Notifies neighbors before going down B) Disables authentication C) Clears the topology table D) Resets all neighbors

Answer 135

Answer: A

Question 136

Which command enables Graceful Shutdown? A) eigrp graceful-shutdown B) shutdown eigrp C) ip eigrp graceful-shutdown D) Not configurable

Answer 136

Answer: A

Question 137

What is EIGRP "Reliable Transport Protocol"? A) Uses RTP for guaranteed packet delivery B) A type of encryption C) A stub feature D) Only for IPv6

Answer 137

Answer: A

Question 138

Which EIGRP packet type is not reliable? A) Hello B) Update C) Query D) Reply

Answer 138

Answer: A

Question 139

What is EIGRP "Goodbye" message? A) Sent during graceful shutdown B) A type of query C) An authentication packet D) Only in OSPF

Answer 139

Answer: A

Question 140

Which feature is unique to Named EIGRP? A) Per-interface metrics B) Address families C) Both D) Neither

Answer 140

Answer: B

Question 141

Branch office routers should be configured as: A) EIGRP stubs B) Full EIGRP peers C) OSPF ASBRs D) BGP speakers

Answer 141

Answer: A

Question 142

A WAN link with 512Kbps bandwidth should have EIGRP Hello timers set to: A) 5 seconds B) 60 seconds C) 10 seconds D) 30 seconds

Answer 142

Answer: B

Question 143

To prefer a specific path in EIGRP, adjust: A) Bandwidth on the interface B) Delay on the interface C) Both D) Neither (use AD)

Answer 143

Answer: C

Question 144

EIGRP authentication fails between two routers. The first check should be: A) Key-chain names B) Key-strings C) AS numbers D) All of the above

Answer 144

Answer: D

Question 145

EIGRP routes are missing from the routing table. Possible causes include: A) Passive interface B) Route filtering C) Mismatched K-values D) All of the above

Answer 145

Answer: D

Question 146

To reduce EIGRP query traffic in a large network, use: A) Summarization B) Stub routing C) Both D) Neither

Answer 146

Answer: C

Question 147

EIGRP neighbors are flapping. The most likely cause is: A) Unstable link B) MTU mismatch C) Authentication failure D) All of the above

Answer 147

Answer: D

Question 148

In a dual-homed branch office, EIGRP variance should be used to: A) Enable unequal-cost load balancing B) Block one path C) Disable summarization D) Change AD

Answer 148

Answer: A

Question 149

To filter a specific EIGRP route, use: A) Distribute-list B) Prefix-list C) Route-map D) All of the above

Answer 149

Answer: D

Question 150

EIGRP is not forming neighbors over a GRE tunnel. The issue is likely: A) Missing no ip split-horizon B) MTU mismatch C) Authentication D) All of the above

Answer 150

Answer: D

Question 151

"EIGRP-4-NHREG" errors indicate: A) No route to next-hop B) Authentication failure C) SIA route D) Hello timer mismatch

Answer 151

Answer: A

Question 152

"DUAL-5-NBRCHANGE" messages are logged when: A) Neighbor state changes B) Routes are deleted C) Queries are sent D) All of the above

Answer 152

Answer: A

Question 153

High "Q Cnt" in show ip eigrp neighbors indicates: A) Many pending queries B) Stable network C) Authentication working D) Load balancing active

Answer 153

Answer: A

Question 154

To diagnose EIGRP packet loss, use: A) debug eigrp packets B) show ip eigrp traffic C) Ping between neighbors D) All of the above

Answer 154

Answer: D

Question 155

EIGRP routes are stuck in "Active" state. The first step is to: A) Check neighbor connectivity B) Increase the active timer C) Clear neighbors D) Disable authentication

Answer 155

Answer: A

Question 156

EIGRP is using suboptimal paths. The fix is to: A) Adjust bandwidth/delay B) Use offset-lists C) Both D) Neither (use OSPF)

Answer 156

Answer: C

Question 157

EIGRP queries are flooding the network. The solution is: A) Summarization B) Stub routing C) Both D) Neither

Answer 157

Answer: C

Question 158

EIGRP authentication is failing. Verify: A) Key-chain time ranges B) Key-strings C) Interface configuration D) All of the above

Answer 158

Answer: D

Question 159

EIGRP is not installing routes. Check: A) Administrative distance B) Route filtering C) K-values D) All of the above

Answer 159

Answer: D

Question 160

EIGRP over Frame Relay is not working. Ensure: A) no ip split-horizon is configured B) Subinterfaces are used C) PVCs are active D) All of the above

Answer 160

Answer: D

Question 161

EIGRP over DMVPN requires: A) NHRP registration B) no ip split-horizon C) MTU adjustments D) All of the above

Answer 161

Answer: D

Question 162

What does "EIGRP-4-PAKERR" syslog message indicate? A) Corrupted EIGRP packet received B) Authentication failure C) MTU mismatch D) Hello timer mismatch

Answer 162

Answer: A

Question 163

Which debug command shows EIGRP packet retransmissions? A) debug eigrp packets B) debug eigrp nsf C) debug eigrp rtp D) debug ip eigrp

Answer 163

Answer: C (RTP = Reliable Transport Protocol)

Question 164

What causes "EIGRP-3-SIAQUERY" messages? A) Stuck-in-Active route not receiving replies B) Authentication failure C) Route summarization error D) Invalid K-values

Answer 164

Answer: A

Question 165

How do you resolve continuous SIA routes? A) Increase active-timer B) Implement route summarization C) Configure stub routers D) All of the above

Answer 165

Answer: D

Question 166

What does "EIGRP-5-NOROUTE" indicate? A) No feasible successor exists B) Authentication mismatch C) Invalid network statement D) Split-horizon blocking

Answer 166

Answer: A

Question 167

Which command shows EIGRP retransmission queues? A) show ip eigrp traffic B) show eigrp rtp C) show ip eigrp topology retry D) No direct command (use debug eigrp rtp)

Answer 167

Answer: D

Question 168

What is the first step when EIGRP neighbors won't form over a VPN? A) Check crypto ACLs B) Verify no ip split-horizon C) Ping multicast address 224.0.0.10 D) Disable authentication

Answer 168

Answer: C (Tests basic multicast connectivity)

Question 169

Why would EIGRP install a route with higher AD than a static route? A) Static route has lower AD (1) by default B) EIGRP external routes have AD 170 C) Both A and B D) Never happens

Answer 169

Answer: C

Question 170

ow do you verify if EIGRP is using Wide Metrics? A) show ip protocols B) show ip eigrp topology *(look for 64-bit metrics)* C) show running-config | section eigrp D) All of the above Answer: B

Answer 170

Answer: B

Question 171

When migrating from EIGRP to OSPF, use: A) Redistribution with route-tags B) redistribute ospf 1 metric 10000 100 255 1 1500 C) Dual-stack during transition D) All of the above

Answer 171

Answer: D

Question 172

Why use EIGRP in a data center? A) Fast convergence with DUAL B) No area design constraints C) Supports FabricPath D) All of the above

Answer 172

Answer: D

Question 173

What is the primary drawback of EIGRP in multi-vendor networks? A) Cisco-proprietary B) No support for IPv6 C) Complex configuration D) None (works everywhere)

Answer 173

Answer: A

Question 174

How does EIGRP interact with SD-Access? A) Used for control-plane VXLAN routing B) Replaced by LISP C) Both D) Neither

Answer 174

Answer: B (SD-Access uses LISP, not EIGRP)

Question 175

Which EIGRP feature is critical for IoT networks? A) Stub routing B) Low bandwidth usage C) Fast convergence D) All of the above

Answer 175

Answer: D

Question 176

In MPLS networks, EIGRP is typically: A) Used between PE-CE routers B) Replaced by BGP C) Both D) Neither

Answer 176

Answer: A

Question 177

What is the key advantage of EIGRP in branch offices? A) Minimal configuration B) No need for hierarchical design C) Works over low-bandwidth links D) All of the above

Answer 177

Answer: D

Question 178

How does EIGRP support multicast routing? A) Uses PIM for multicast traffic B) Native EIGRP multicast for updates only C) Both D) Neither

Answer 178

Answer: B (Separate protocol from PIM)

Question 179

Which EIGRP feature reduces WAN bandwidth usage? A) Incremental updates B) Stub routing C) Summarization D) All of the above

Answer 179

Answer: D

Question 180

What is the primary security risk with EIGRP? A) No native encryption (MD5 only) B) Vulnerable to route injection C) Both D) Neither

Answer 180

Answer: C

Question 181

EIGRP routes are missing after a router reboot because: A) NSF (Non-Stop Forwarding) wasn’t configured B) Neighbors didn’t preserve topology during restart C) Both D) Neither

Answer 181

Answer: C

Question 182

How does BFD improve EIGRP convergence? A) Faster failure detection than Hello timers B) Reduces SIA routes C) Both D) Neither

Answer 182

Answer: C

Question 183

Which command enables BFD for EIGRP? A) bfd eigrp B) ip eigrp bfd C) bfd interval 50 min_rx 50 multiplier 3 D) None (configured under interface)

Answer 183

Answer: D

Question 184

What is "EIGRP Named Mode" primarily used for? A) Simplified IPv4/IPv6 configuration B) Per-interface metric tuning C) Both D) Neither

Answer 184

Answer: A

Question 185

How do you troubleshoot EIGRP over wireless links? A) Adjust Hello timers B) Enable eigrp log-neighbor-changes C) Check for multicast packet loss D) All of the above

Answer 185

Answer: D

Question 186

What causes "EIGRP-4-HOLD" syslog messages? A) Neighbor hold timer expired B) Interface congestion C) Authentication failure D) Route filtering

Answer 186

Answer: A

Question 187

Which EIGRP feature prevents routing loops during convergence? A) Feasible Condition B) Split Horizon C) Both D) Neither

Answer 187

Answer: C

Question 188

How do you verify EIGRP NSF (Non-Stop Forwarding) status? A) show ip eigrp nsf B) show eigrp graceful-restart C) Both D) Neither (no direct command)

Answer 188

Answer: D (Use show ip protocols)

Question 189

What is the most efficient way to summarize EIGRP at the core? A) Manual summary at distribution layer B) Auto-summary C) Route filtering D) None of the above

Answer 189

Answer: A

Question 190

Which final command confirms EIGRP is fully operational? A) show ip eigrp topology all-links B) show ip route eigrp C) show ip protocols D) All of the above

Answer 190

Answer: D