CH10 - Routing Protocol Characteristics, RIP, EIGRP, IS-IS - Q&A

Which routing protocols would you select if you needed to take advantage of VLSMs? (Select all that apply.) a. RIPv1 b. RIPv2 c. IGRP d. EIGRP e. OSPF f. IS-IS

B, D, E, and F.

Which routing protocol has the lowest admin distance? a. RIP b. EIGRP c. OSPF d. IS-IS c. iBGP

B. Administrative distances are EIGRP=90, OSPF=110, IS-IS=115, RIP=120, iBGP=200.

What is the default IS-IS metric for a T1 interface? a. 5 b. 10 c. 64 d. 200

B. The default IS-IS cost metric for any interface type is 10.

Which routing protocol allows for unequal cost multipath routing? a. IS-IS b. OSPF c. EIGRP d. RIPv2

C

Which routing protocol would be supported on an IPv6 network with multiple vendor routers? a. RIPv2 b. EIGRP for IPv6 c. BGPv6 d. OSPFv3 e. RIPv3 f. All of the above g. B and D

D. OSPFv3 is the only correct answer. RIPv2 is for IPv4 networks. EIGRP is not a standards-based protocol. BGPv6 and RIPv3 do not exist.

True or false: Link-state routing protocols are more CPU and memory intensive than distance-vector routing protocols.

True

True or false: The path with the lowest cost is preferred.

True

Select those answers that are characteristics of EIGRP? (Select four.) a. ASN and K values must match to form neighbors b. Can use multiple unequal paths c. Summary routes have an AD of 150. d. External routes have an AD of 170. e. Exchanges the full routing table every 60 seconds. f. Uses multicast address 224.0.0.10 for updates. g. Does not support MD5 authentication

A B D F

Which are design considerations with EIGRP? a. The neighbor command is used to enable unicast communication. b. The neighbor command can be used to establish adjacency with non-Cisco routers. c. The ASN and K values must match to establish neighbors. d. Virtual links can be used to establish neighbors over an area.

A C

Which routing protocol has the highest admin distance? a. RIP b. EIGRP c. OSPF d. IS-IS c. BGP

A. Administrative distances are BGP=20, EIGRP=90, OSPF=110, IS-IS=115, and RIP=120.

What is a major advantage of a classless structured network over a classless network? a. There is less overhead in classless networks. b. There is more overhead in classless networks. c. Less IP addresses are used in classful networks. d. Classless networks do not have advantages over classful networks.

A. Classless networks have less routing overhead.

Which routing protocol is distance-vector and classless? a. RIPv2 b. EIGRP c. OSPF d. IS-IS

A. RIPv2 is a classless distance-vector routing protocol.

Which of the following is the best measurement of an interface's reliability and load? a. Reliability 255/255, load 1/255 b. Reliability 255/255, load 255/255 c. Reliability 1/255, load 1/255 d. Reliability 1/255, load 255/255

A. The best reliability is 255/255 (100 percent), and the best load is 1/255 (~0 percent).

EIGRP has a route with a metric of 20. There are two feasible successors with metrics of 35 and 45. If the variance 2 command is invoked, how many active routes are there for this route? a. 1. b. 2. c. 3. d. Variance has to be used for equal-cost routes.

B. 2. The variance command configures EIGRP to accept unequal-cost routes with a metric of less than 2 × 20 = 40. The route with a metric of 35 is added.

Which type of routing protocol sends periodic routing updates? a. Static b. Distance-vector c. Link state d. Hierarchical

B. Distance-vector routing protocols send periodic updates.

On an IPv6 network, you have RIPng and EIGRP running. Both protocols have a route to destination 10.1.1.0/24. Which route gets injected into the routing table? a. The RIPng route b. The EIGRP route c. Both routes d. Neither route because of a route confl ict

B. EIGRP route has a lower administrative distance.

Which of the following is true regarding routing metrics? a. If the metric is bandwidth, the path with the lowest bandwidth is selected. b. If the metric is bandwidth, the path with the highest bandwidth is selected. c. If the metric is bandwidth, the highest sum of the bandwidth is used to calculate the highest cost. d. If the metric is cost, the path with the highest cost is selected.

B. If bandwidth is used, the path with the highest bandwidth is selected. If cost is used, the path with the lowest cost is selected.

Both OSPF and EIGRP are enabled on a router with default values. Both protocols have a route to a destination network in their databases. Which route is entered into the routing table? a. The OSPF route. b. The EIGRP route. c. Both routes are entered with load balancing. d. Neither route is entered; an error has occurred.

B. OSPF has an administrative distance of 110. EIGRP has an administrative distance of 90. The route with the lower administrative distance is selected: EIGRP.

Which standards-based protocol would you select in a large IPv6 network? a. RIPng b. OSPFv3 c. EIGRP for IPv6 d. RIPv2

B. OSPFv3 is the only standards-based routing protocol in the list that supports large networks. RIPng has limited scalability.

Which distance-vector routing protocol is used for IPv6 networks? a. OSPFv2 b. RIPng c. OSPFv3 d. BGPv3

B. RIPng is a distance-vector routing protocol that is used in IPv6 networks.

What is the default metric for any interface for the IS-IS routing protocol? a. 5 b. 10 c. 70 d. 100

B. The default metric for interfaces for IS-IS is 10.

Which parameters are included in the computation of the EIGRP composite metric used by default? a. Bandwidth and load b. Bandwidth and delay c. Bandwidth and reliability d. Bandwidth and maximum transmission unit (MTU)

B. The default metrics for EIGRP are bandwidth and delay.

Which routing protocol converges most quickly? a. BGP b. OSPF c. EIGRP d. RIPv2 e. IS-IS

C

Which routing protocol uses multicast FF02::A and Next Header protocol 88? a. IS-IS for IPv6 b. OSPFv3 c. EIGRP for IPv6 d. RIPng

C

Which type of routing protocol would you use when connecting to an Internet service provider? a. Classless routing protocol b. Interior gateway protocol c. Exterior gateway protocol d. Classful routing protocol

C

Which two link-state routing protocols support IPv6? a. BGP4 b. EIGRP c. OSPF d. RIPng e. IS-IS

C E

Which of the following routing protocols are fast in converging when a change in the network occurs? (Select three.) a. RIPv1 b. RIPv2 c. EIGRP d. OSPF e. IS-IS f. BGP

C, D, and E. Link-state routing protocols plus EIGRP's hybrid characteristics converge faster.

What is the system ID of the following NET? 49.0001.1900.6500.0001.00 a. 49.0001 b. 0001.1900.6500 c. 1900.6500.0001 d. 0001.00

C. 1900.6500.0001 is the system ID, 49 is the AFI, and 0001 is the area ID.

Which routing protocol implements the Diffusing Update Algorithm (DUAL)? a. IS-IS b. IGRP c. EIGRP d. OSPF

C. EIGRP implements DUAL.

Which routing protocol requires only Cisco routers on the network? a. RIPv1 b. RIPv2 c. EIGRP d. OSPF e. IS-IS f. BGP g. All of the above

C. EIGRP is supported only on Cisco routers.

Which routing protocol should be used if the network requirements include fastest convergence time and unequal load balancing? a. BGP b. OSPF c. EIGRP d. RIPv2

C. EIGRP provides fast convergence and unequal load balancing.

If you are designing a large corporate network that cannot be designed in a hierarchy, which routing protocol would you recommend? a. RIPv1 b. RIPv2 c. EIGRP d. OSPF e. IS-IS f. BGP

C. EIGRP supports large networks and does not require a hierarchical network.

How is convergence related to routing information? a. The speed of convergence affects the frequency of routing updates. b. The faster the convergence, less consistent routing information is produced. c. The faster the convergence, more consistent routing information is produced. d. There is no relation between convergence and routing information consistency.

C. Faster routing convergence means more accurate information.

A small network is experiencing excessive broadcast traffic and slow response times. The current routing protocol is RIPv1. What design changes would you recommend? a. Migrate to RIPv2. b. Migrate to RIPng. c. Migrate to EIGRP for IPv4. d. Migrate to EIGRPv6.

C. To reduce broadcast traffic, use EIGRP for IPv4 as the routing protocol for the network. RIPng and EIGRPv6 are for IPv6 networks.

Which of the following are classless routing protocols? a. RIPv1 and RIPv2 b. EIGRP and RIPv2 c. IS-IS and OSPF d. Answers B and C

D. EIGRP, RIPv2, IS-IS, and OSPF are all classless routing protocols.

In IS-IS networks, the backup designated router (BDR) forms adjacencies to what routers? a. Only to the DR. b. To all routers. c. The BDR only becomes adjacent when the DR is down. d. There is no BDR is IS-IS.

D. IS-IS does not define BDRs.

Which IGP protocol is a common alternative to EIGRP and OSPF as a routing protocol for large service provider networks? a. OSPFv3 b. RIPv2 c. BGP4 d. IS-IS

D. IS-IS.

On a router, both EIGRP and OSPF have internal routes to 198.168.10.0/24. Which route is injected into the routing table?

The EIGRP route. EIGRP routes have an administrative distance of 90, and OSPF routes have an administrative distance of 100. The lower administrative distance is preferred.

On a router, both RIPv2 and IS-IS have a route to 198.168.10.0/24. Which route is injected into the routing table?

The IS-IS route. IS-IS routes have an administrative distance of 115, and RIP routes have an administrative distance of 120. The lower administrative distance is preferred.

On a router, EIGRP has a route to the destination with a prefix of /28, and OSPF has a route to the destination with a prefix of /30. Which is used to reach the destination?

The OSPF route, because it has a more specific route.

For what routing protocol metric is the value of a Fast Ethernet interface calculated as 108/108 = 1?

The metric is 108/BW. If BW = 100 Mbps = 108, the metric = 108/108 = 1.

True or false: A link with a reliability of 200/255 is preferred over a link with a reliability of 10/255.

True

Match the EIGRP component with its description. i. RTP ii. DUAL iii. Protocol-dependent modules iv. Neighbor discovery a. An interface between DUAL and IPX RIP, IGRP, and AppleTalk b. Used to deliver EIGRP messages reliably c. Builds an adjacency table d. Guarantees a loop-free network

i = B, ii = D, iii = A, iv = C.

Match each EIGRP parameter with its description. i. Feasible distance ii. Successor iii. Feasible successor iv. Active state a. The best path selected by DUAL. b. The successor is down. c. The lowest calculated metric of a path to reach the destination. d. The second-best path.

i = C, ii = A, iii = D, iv = B.

Match the loop-prevention technique (numerals) with its description (letters). i. Split horizon ii. Poison reverse iii. Triggered updates iv. Counting to infinity a. Sends an infinite metric from which the route was learned b. Drops a packet when the hop count limit is reached c. Suppresses a route announcement from which the route was learned d. Sends a route update when a route changes

i = C, ii = A, iii = D, iv = B.

Match the protocol with the characteristic. i. EIGRP for IPv6 ii. RIPv2 iii. RIPng iv. EIGRP a. Uses multicast FF02::9 b. Uses multicast 224.0.0.9 c. Uses multicast 224.0.0.10 d. Uses multicast FF02::A

i = D, ii = B, iii = A, iv = C.

True or false: Link-state routing protocols send periodic routing updates.

False. Distance-vector routing protocols send periodic routing updates.

True or false: RIPv2 was created to support IPv6.

False. RIPng is used with IPv6 networks.

True or false: A link with a load of 200/255 is preferred over a link with a load of 10/255.

False. The link with the lower load is preferred.

Which routing protocols permit an explicit hierarchical topology? a. BGP b. EIGRP c. IS-IS d. RIP e. OSPF f. B and D g. C and E

G. IS-IS and OSPF permit an explicit hierarchical topology.

Loops can cause broadcast storms and congestion. How do distance-vector routing protocols handle this? (Select all that apply.) a. Counting to infi nity b. Poison reverse c. Split horizon d. Vector routing

A B C

Which of the following characteristics are implemented differently between distance vector and link-state routing protocols? a. IP route tables b. Route information distribution c. Routing tables d. Forwarding of traffic e. Verification of route information sources f. Administrative distance

B, C, and E.

A hierarchical design of EIGRP helps with which of the following? (Select two.) a. Redistribution b. Route summarization c. Faster convergence d. Load balancing

B C

Which are the two fastest converging routing protocols? a. IS-IS b. OSPF c. EIGRP d. RIPv2 e. BGP4

B C

Which two EIGRP features make it appropriate for a company's network? a. Slow convergence b. VLSM support c. DUAL d. Automatic summarization e. Multivendor support

B and C. EIGRP uses DUAL for fast convergence and supports VLSMs.

Which two statements are true for IGPs and EGPs? a. IGPs can be substituted with static routing. b. IGPs are better at fi nding the fastest paths across the network. c. IGPs must converge quickly, but EGPs do not. d. IGPs are for inter-autonomous system connections, EGPs are used for intraautonomous system connections.

B and C. IGPs converge faster than EGPs.

Which routing protocols support VLSMs? (Select all that apply.) a. RIPv1 b. RIPv2 c. EIGRP d. OSPF e. IS-IS f. All of the above

B, C, D, and E. RIPv1 does not support VLSMs.

What routing protocol parameter is concerned with how long a packet takes to travel from one end to another in the internetwork?

Delay measures the amount of time a packet takes to travel from one end to another in the internetwork.

You are connecting your network to an ISP. Which routing protocol would you use to exchange routes? a. RIPv1 b. RIPv2 c. EIGRP d. OSPF e. IS-IS f. BGP g. All of the above

F. BGP is used to connect to ISPs.