Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

IT > Dynamic Routing Protocols > Flashcards

Dynamic Routing Protocols Flashcards

0
Q

What are the three types of dynamic routing protocols (regarding how they actually function)? Give an example of each.

A

Distance Vector - RIP
Advanced Distance Vector - EIGRP
Link-State - OSPF, IS-IS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

What is the purpose of dynamic routing protocols?

A

To allow routers to share network topology information. The routers use this information to choose what are, according to the routing protocol, the best routes to different destinations and populate their routing tables with these routes. Without dynamic routing protocols EVERY route would have to be input manually.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How does a distance vector routing protocol determine the best route? Why does this not always result in the best routing decisions?

A

Comparing the number of hops necessary for each route; the route with the fewest hops is chosen.

Because link speed is ignored.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the two types of routing protocols (regarding what portion of the network they cover)? Give an example of each.

A

Internal Gateway Protocols (EIGRP, OSPF, RIP) and External Gateway Protocols (BGP).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What three tables do link-state protocols create? What is the purpose of each?

A

Topology Table - stores the topology
of the network.

Routing Table - stores best routes

Neighbor Table - stores neighbors
that are participating
in the routing
protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What path-selection algorithm does EIGRP use? What does it stand for?

A

DUAL (Diffused Update Algorithm)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Describe the metric that DUAL uses. What things are taken into consideration by default? What additional factors can it be configured to consider?

A

It’s a composite metric - it takes multiple factors into consideration. By default it uses bandwidth and delay to choose the best path. Load and reliability are optional.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

View information regarding neighboring devices participating in EIGRP:

A

show IP EIGRP neighbors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

View information about interfaces that are configured for EIGRP on a device:

A

show IP EIGRP interfaces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the only dynamic routing protocol that offers unequal-cost load balancing?

A

EIGRP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the commands associated with configuring EIGRP?

A 
router eigrp (AS #)
network (IP)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Show information regarding any routing protocols enabled on the device:

A

show IP protocols

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Make EIGRP run classless:

A

R1(config)#router EIGRP (AS#)

R1(config-router)#no auto-summary

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Give a summary of the steps (from the user prompt!) involved in configuring and verifying EIGRP for IPv6:

A
  1. enable
  2. configure terminal
  3. ipv6 unicast-routing
  4. interface [interface name]
  5. no shut
  6. ipv6 enable
  7. ipv6 eigrp [AS #]
  8. ipv6 router eigrp [AS #]
  9. router-id [ip-address] - (only if the router
    doesn’t have an IPv4 address assigned
  10. exit
  11. show ipv6 eigrp [AS #] interfaces [interface name] [detail]
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In what DRP might a router be referred to as an internal router? What does this mean?

A

In OSPF, an internal router is a router that sits inside a particular area.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Set an interface’s cost in OSPF:

A

(config-if)# IP OSPF cost (cost#)

16
Q

What are the benefits of using multiarea OSPF?

A

Each router has to store the topology of a smaller portion of the network (the portion inside its area). This can cut down on processing time when topology changes.

17
Q

Command format for creating an OSPF area:

A

router OSPF 1

network (IP address) (wildcard mask) area(area#)

18
Q

Turn off EIGRP on a router:

A

no router EIGRP (AS #)

19
Q

For OSPF Neighbors to “neighbor up”, what must be the same?

A 
• Area ID
• Hello 
• Dead Timer
• MTU
• Authentication settings must match*
     *(if using authentication)
20
Q

Which DRP, EIGRP or OSPF, has a lower default administrative distance?

A

EIGRP - its default AD is 90, OSPF’s is 110

21
Q

What are the characteristics of RIPv2 that make it distinct from RIP?

A

It sends the subnet address along with routing updates, so it supports classless routing. You can use VLSM and CIDR.

It supports clear text and MD5 authentication.

Uses multicast routing updates - 224.0.0.9. Fewer network resources used.

Uses external route tags for routes received from exterior gateway protocols.

22
Q

What is a feasible successor route? What criterion must a route meet in order to be considered a feasible successor?

A

In EIGRP the second-best route to a destination is called a feasible successor route and is included in the routing table. The route’s advertised distance must be less than the current successor route’s feasible distance.

23
Q

What is a current successor route?

A

In EIGRP a current successor route is the best route to a destination (the one with the lowest feasible distance).

24
Q

What command would you use to view OSPF routers establishing a neighbor relationship in real time?

A

debug ip ospf adj

25
Q

Your router has the following interfaces configured:

fa0/0: 192.32.1.1
fa0/1: 192.32.1.2
loopback 0: 10.1.1.1
loopback 10: 10.2.2.2

You configure OSPF. What is your OSPF router ID?

A

10.2.2.2 - if your device has loopback interfaces, the OSPF router ID will be the highest of these. Otherwise it will be the address of the interface with the highest IP address.

26
Q

Which command tells you whether route-filtering is enabled?

show interface
show route-filtering
show access-list
show ip protocols

A

show ip protocols

Route-filtering can be implemented with access lists but the show access-list command won’t tell you what the ACL is for.

27
Q

Configure OSPF plaintext authentication with a password of cisco.

A

ip ospf authentication

ip ospf authentication-key cisco

28
Q

You observe the following in the output of the “show ip route” command on Router A:

O IA 172.16.1.0 [110/90] via 10.1.1.1 0:02:25, FastEthernet0/0

What are all the things you’ve learned about this around based on the output?

A

• It’s an OSPF route (O)
• 172.16.1.0 is in a different OSPF area (IA)
• The cost to reach the network is 90 (default
AD is 110 for OSPF)
• The network is reachable through 10.1.1.1
• This route is been alive for 2 minutes and 25
seconds
• The 10.1.1.1 interface and the
178.16.1.0 network are reachable from the
local device’s FastEthernet0/0 interface

29
Q

You observe the following in the output of the “show ip route” command on Router A:

C 172.16.1.0 is directly connected via FastEthernet0/0

What are all the things you’ve learned about this around based on the output?

A

• This is a directly connected route (C)
• No DRP was needed to teach Router A this
route
• 172.16.1.0 is connected to the fa0/0 interface

30
Q

How can link-state RPs limit the scope of routing updates?

A

Link-state protocols allow you to segment the network into areas. At the area boundary you can then summarize addresses so that only summarized routes are propagated between areas. These summary routes limit the scope of route changes because only changes to these summary routes, not smaller internal changes, will be advertised.

31
Q

Configure OSPF to use plain-text authentication on interface FastEthernet 0/1 with a password of “cisco”:

A

int fa0/1
ip ospf authentication
ip ospf authentication-key cisco

32
Q

You observe the following in the output of the “show ip route” command on Router A:

D 172.16.1.0 [90/56625] via 10.1.1.1 0:02:25, FastEthernet0/0

What are all the things you’ve learned about this around based on the output?

A

• the route was discovered using EIGRP

• the destination is on the same EIGRP
network as Router A (D = same)

  • the administrative distance is 90
  • the feasible distance of this route is 56625

• the route is reachable through neighbor
10.1.1.1

• the route has been in existence for 2 minutes
and 25 seconds

• the destination is reachable through Router
A’s fa0/0 interface

IT (33 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions