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CCIE Routing and Switching Written Exam v5.1

QUESTION 421

Refer to the exhibit. R1 is performing mutual redistribution, but OSPF routes from R3 are unable to reach R2. Which three options are possible reasons for this behavior? (Choose three.)

 

clip_image001

 

A.

R1 requires a seed metric to redistribute RIP.

B.

The RIP version supports only classful subnet masks.

C.

R1 is filtering OSPF routes when redistributing into RIP.

D.

R3 and R1 have the same router ID.

E.

R1 and R3 have an MTU mismatch.

F.

R2 is configured to offset OSPF routes with a metric of 16.

 

Correct Answer: ACF

Explanation:

A. RIP requires a seed metric to be specified when redistributing routes into that protocol. A seed metric is a “starter metric” that gives the RIP process a metric it can work with. The OSPF metric of cost is incomprehensible to RIP, since RIP’s sole metric is hop count. We’ve got to give RIP a metric it understands when redistributing routes into that protocol, so let’s go back to R1 and do so.

C. Filtering routes is another explanation, if the routes to R2 are boing filtered from being advertised to R1.

F. If the metric is offset to 16, then the routes will have reached the maximum hop count when redistributed to RIP. The max hop count for RIP is 16.

 

 

QUESTION 422

What is the maximum number of classes that MQC can support in a single policy map?

 

A.

512

B.

256

C.

128

D.

64

 

Correct Answer: B

 

 

QUESTION 423

Refer to the exhibit. Which command can you enter to resolve this error message on a peer router?

 

clip_image002

 

A.

username <username> password <password>

B.

ppp chap <hostname>

C.

aaa authorization exec if-authenticated

D.

aaa authorization network if-authenticated

 

Correct Answer: A

 

 

QUESTION 424

Which option describes what the default RT filter indicates when you implement the BGP RT constrained route distribution feature?

 

A.

A peer receives only a default route for each VRF.

B.

A peer receives all routes, regardless of the RT value.

C.

A peer receives routes only for RTs that are used on that router.

D.

A peer receives no routes, regardless of the RT value.

 

Correct Answer: B

 

 

QUESTION 425

On a broadcast interface, which two OSPF states support BFD sessions? (Choose two.)

 

A.

DR

B.

BDR

C.

DROTHER

D.

2WAY

E.

FULL

F.

ACTIVE

 

Correct Answer: AB

 

 

QUESTION 426

Which IP SLA operation type uses IP to measure the round-trip time between a router and a device?

 

A.

HTTP

B.

ICMP Echo

C.

ICMP Path Jitter

D.

UDP Jitter for VoIP

 

Correct Answer: B

 

 

QUESTION 427

Which three roles does a key server perform when used with GETVPN? (Choose three.)

 

A.

It authenticates group members.

B.

It manages security policies.

C.

It creates group keys.

D.

It distributes multicast replication policies.

E.

It distributes multicast replication keys.

F.

It configures and routes the GDOI protocol.

 

Correct Answer: ABC

Explanation:

Key server is responsible for maintaining security policies, authenticating the Group Members and providing the session key for encrypting traffic. KS authenticates the individual GMs at the time of registration. Only after successful registration the GMs can participate in group SA.

Reference: http://www.cisco.com/c/en/us/products/collateral/security/group-encrypted-transport-vpn/deployment_guide_c07_554713.html

 

 

QUESTION 428

Which three statements about GLBP are true? (Choose three.)

 

A.

It uses a virtual MAC address that starts with 0070.b4.

B.

It elects a single active virtual gateway to appoint and manage multiple active virtual forwarders.

C.

It allows the configured virtual IP address to be used on a physical interface as well.

D.

It uses a virtual MAC address that starts with 0070.4b.

E.

It elects multiple active virtual gateways to appoint and manage a single active virtual forwarder.

F.

Preemption is enabled for the configured active virtual gateway by default.

 

Correct Answer: ABC

Explanation:

The virtual MAC address in GLBP is 0007.b400.xxyy where xx is the GLBP group number and yy is the different number of each gateway (01, 02, 03…).

One of the routers in a GLBP group is elected as an AVG –  Active Virtual Gateway. There is only one active AVG in a group, and its task is to respond to ARP requests sent to the virtual gateway IP address replying different virtual MAC addresses in response packets.

GLBP allows the configured virtual IP address to be used on a physical interface.

By default, the GLBP gateway preemptive scheme is disabled. A backup virtual gateway can become the AVG only if the current AVG fails, regardless of the priorities assigned to the virtual gateways.

 

 

QUESTION 429

Refer to the exhibit. Which OSPFv3 routes will be visible in the routing table of R2?

 

clip_image004

 

A.

2001:12::1/128

B.

2001:12::1/128, 2001:112::1/128

C.

2001:12::2/128

D.

No OSPFv3 routes will be visible.

 

Correct Answer: D

Explanation:

The command “ipv6 unicast-routing” needs to be configured on both routers before any IPv6 routes will be seen.

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 430

DRAG DROP

Drag and drop the multiprotocol BGP feature on the left to the corresponding description on the right.

 

clip_image006

 

Correct Answer:

clip_image008

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