Who Wins

Question 1

In Routing Protocol Metrics which route wins?

Answer 1

Lowest

Question 2

In Routing Protocol Administrative Distances, which AD wins?

Answer 2

Lowest

Question 3

In Spanning Tree, what determines the Root Bridge?

Answer 3

Lowest priority and the lowest base MAC address

Question 4

In RIP what determines the Metric?

Answer 4

Hop Count

Question 5

In OSPF what determines the Metric?

Answer 5

The sum of all Outgoing Interface Costs to get to the network.

Question 6

In EIGRP what determines the Composite Metric?

Answer 6

Metric = (( 10^7 / least_bandwidth in Kbps ) + Cumulative Delay ) * 256

Question 7

In Spanning Tree, which Bridge ID wins?

Answer 7

• Lowest priority in the BID first
• If priorities tie then lowest MAC address

Question 8

In OSPF, which router becomes the Designated Router?

Answer 8

Router with the highest Priority, if a tie then highest Router ID

Question 9

In OSPF, which router becomes the Backup DR?

Answer 9

BDR election also uses highest priority and then highest router-id.

When a new network segment is initialized the first election is for BDR. The elected BDR recognizes that there is not a DR and becomes DR and there is another election for a BDR.

Question 10

When checking delay on an interface using the ‘show ip eigrp top’ command what unit of measure is delay in?

Answer 10

Microseconds

Question 11

In order to use Delay in the EIGRP metric formula what must you before adding the Delay measurement?

Answer 11

Take Microseconds and Divide by 10.

Question 12

In Spanning Tree, how is the root port determined?

Answer 12

Whichever port has the least OUTBOUND Interface Cost to get to the Root.

Question 13

HSRP Active Router

Answer 13

Highest priority wins

Tie breaker - Highest IP address

Question 14

In Spanning-tree, which Port Priority is better? Default is 128.

Answer 14

Lower is better.

Question 15

LACP System Priority

Answer 15

Lowest

Question 16

LACP Port Priority

Answer 16

Lowest

Question 17

In an IGMP Querier Election

Answer 17

Lowest LAN interface IP address

Question 18

In PIM when identifying the RPF interface, if 2 interfaces have the same AD and metric back to the source?

Answer 18

The interface with the highest IP address wins

Question 19

in multicast, two PIM Forwarders on the same LAN

Answer 19

• lowest administrative distance
• lowest metric back to the source
• then highest IP address

Question 20

Multiple PIM routers on the same subnet.

Answer 20

• Highest DR Priority value
• Tie breaker - Highest IP address on the subnet

Question 21

Multicast with Auto RP when multiple C-RPs advertise themselves.

Answer 21

Highest IP address wins and becomes the active RP

Question 22

C-BSR election

Answer 22

• Highest Priority
• If tie then C-BSR with highest IP address wins

Question 23

PIM Routers run algorithm on BSR-provided Group-to-RP Mapping Cache to choose an RP. Which candidate wins?

Answer 23

• C-RP with the longest prefix match, if a tie then,
• C-RP with the Lowest Priority wins, if a tie then,
• C-RP with highest hash value, if still a tie then,
• The highest IP address wins

Question 24

crypto isakmp policy [priority]

Answer 24

The lowest number wins. Lowest number possible is 1.

Question 25

BGP neighbors both propose different HOLD times. Who wins?

Answer 25

The shortest HOLD time wins.

Question 26

In QOS using the CS PHB with values CS0 thru CS7, which one gets better priority?

Answer 26

CS7 - the higher the CS the better the priority

Question 27

For layer 2 QOS the Priority Code Point (PCP) using Class of Service with 8 levels

Answer 27

* CoS 0 is lowest and treated worst * CoS 7 is highest and treated best

Question 28

In Wireless, SNR (signal-to-noise ratio)

Answer 28

A larger SNR value is better. The larger the number the larger the gap is between the noise floor and the receiver's sensitivity level

Question 29

In Wireless, channel utilization

Answer 29

The lower the better

Question 30

In Wireless, Signal Strength

Answer 30

Signal strength of -50 is better than -70

Question 31

In Wireless, connection score

Answer 31

in percentage with 100% being the best

Question 32

In Wireless, Received Signal Strength Indicator (RSSI)

Answer 32

-50 dBm is better than -70 dBm

Question 33

BGP PA - Weight

Answer 33

Higher value wins

Question 34

BGP PA Local Pref - lower or higher?

Answer 34

Higher is preferred

Question 35

BGP Path Attribute - MED

Answer 35

The lower the MED the more preferred it is

Question 36

In BGP who manages the connection during the Connect State

Answer 36

Router with the higher BGP router ID

Question 37

BGP PA AIGP Metric

Answer 37

Lowest wins

Question 38

BGP PA IGP metric to next hop.

Answer 38

Lowest wins

Question 39

BGP PA Peer router ID

Answer 39

Lowest wins

Question 40

BGP PA Peer IP address.

Answer 40

Lowest wins

Question 41

Under 'router ospf' if an interface matches two network statements each specifying a different area which area/network statement is chosen?

Answer 41

The area with the longest matching network statement wins

Question 42

If OSPF is configured directly on an interface plus the interface is included in a network statement under router OSPF which takes precedence?

Answer 42

The interface config trumps the network statement.

Question 43

OSPF authentication: which key in the key chain will OSPF use to sign egress packets?

Answer 43

The key with the highest key ID

Question 44

OSPF: Who wins when there are conflicting parameters between what is under the router process configuration and what is on the interface

Answer 44

Interface parameters take precedence

Question 45

OSPF: when there is a conflict between what is directly under the "router ospf" command and what is under 'address-family'

Answer 45

Address-family wins

Question 46

OSPF: which Hello timer will IPv6 use in the following example: interface gig0/0 ip address 10.1.1.0 255.255.255.0 ipv6 address 2001:DB8:0:12::2/64 ospfv3 10 hello-interval 11 ospfv3 10 ipv6 area 0 ospfv3 10 ipv6 hello-interval 10 ospfv3 10 ipv4 area 0

Answer 46

The Hello timer specified with the address family will take precedence over the Hello timer without an address family

Question 47

In MPLS, which LDP neighbor gets the passive Server role?

Answer 47

The router with the lowest LDP ID

Question 48

In BGP, which takes priority between conflicting statements in a BGP Peer Group and in a BGP neighbor statement.

Answer 48

BGP Neighbor Statement wins

Question 49

In IPV6 First Hop Security Features - IPv6 Snooping, there are 2 policies, one for the VLAN and one for the interface. Which takes precedence?

Answer 49

The policy on the interface.

Question 50

In OSPF, if the exact same route is advertised in Type 7 LSAs by 2 different ASBRs which route is preferred?

Answer 50

The route coming from the ASBR with the lowest Router ID.