CCIE Routing and Switching Written Exam v5.1

 

QUESTION 541

DRAG DROP

Drag and drop the path-selection criteria on the left into the correct route-selection order on the right, that a router will use when having multiple routes toward the same destination.

 

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Correct Answer:

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QUESTION 542

DRAG DROP

Drag and drop the argument of the mpls ip cef load-sharing command on the left to the function it performs on the right.

 

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Correct Answer:

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QUESTION 543

Refer to the exhibit. Which configuration reduces CPU utilization on R2 while still advertising the connected routes of R2 to R1?

 

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A.

Configure eigrp stub connected on R2.

B.

Configure eigrp stub receive-only on R1.

C.

Configure eigrp stub static on R2.

D.

Configure eigrp stub summary on R1.

 

Correct Answer: A

 

 

QUESTION 544

What is the new designation for the MPLS EXP (experimental) bits?

 

A.

QoS bits

B.

traffic class bits

C.

flow bits

D.

precedence bits

 

Correct Answer: B

Explanation:

To avoid misunderstanding about how this field may be used, it has become increasingly necessary to rename this field. This document changes the name of the EXP field to the “Traffic Class field” (“TC field”). In doing so, it also updates documents that define the current use of the EXP field.

Reference: https://tools.ietf.org/html/rfc5462

 

 

QUESTION 545

DRAG DROP

Drag and drop the RIP configuration command on the left to the function it performs on the right.

 

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Correct Answer:

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QUESTION 546

How does having an EIGRP feasible successor speed up convergence?

 

A.

EIGRP sends queries only if there is a feasible successor, which decreases the number of routers that are involved in convergence.

B.

EIGRP sends queries only if there is not a feasible successor, which causes less control traffic to compete with data.

C.

EIGRP immediately installs the loop-free alternative path in the RIB.

D.

EIGRP preinstalls the feasible successor in the RIB in all cases, which causes traffic to switch more quickly.

 

Correct Answer: C

Explanation:

Feasible Successor

A next-hop router that serves as backup to the current successor.

The condition is that the said router’s AD (or RD) is less than the FD of the current successor route.

Once the feasible successor is selected, they are placed in the topology table. If a change in topology occurs which requires a new route, DUAL looks for the feasible successor and uses it as new route immediately, resulting in fast convergence.

 

Reference: http://routemyworld.com/2008/07/page/2/

 

 

QUESTION 547

DRAG DROP

Drag and drop each STP port role on the left to the matching statement on the right.

 

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Correct Answer:

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QUESTION 548

Which two events occur when a packet is decapsulated in a GRE tunnel? (Choose two.)

 

A.

The destination IPv4 address in the IPv4 payload is used to forward the packet.

B.

The TTL of the payload packet is decremented.

C.

The source IPv4 address in the IPv4 payload is used to forward the packet.

D.

The TTL of the payload packet is incremented.

E.

The version field in the GRE header is incremented.

F.

The GRE keepalive mechanism is reset.

 

Correct Answer: AB

Explanation:

After the GRE encapsulated packet reaches the remote tunnel endpoint router, the GRE packet is decapsulated. The destination address lookup of the outer IP header (this is the same as the tunnel destination address) will find a local address (receive) entry on the ingress line card. The first step in GRE decapsulation is to qualify the tunnel endpoint, before admitting the GRE packet into the router, based on the combination of tunnel source (the same as source IP address of outer IP header) and tunnel destination (the same as destination IP address of outer IP header). If the received packet fails tunnel admittance qualification check, the packet is dropped by the decapsulation router
. On successful tunnel admittance check, the decapsulation strips the outer IP and GRE header off the packet, then starts processing the inner payload packet as a regular packet.

When a tunnel endpoint decapsulates a GRE packet, which has an IPv4/IPv6 packet as the payload, the destination address in the IPv4/IPv6 payload packet header is used to forward the packet, and the TTL of the payload packet is decremented.

Reference: http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/addr-serv/configuration/guide/b-ipaddr-cg53asr9k/b-ipaddr-cg53asr9k_chapter_01001.html

 

 

QUESTION 549

Which configuration sets a minimum quality of service on a Layer 2 access switch?

 

A.

mls qos cos override

mls qos cos 2

B.

mls qos cos 2

C.

mls qos trust cos

mls qos cos 2

D.

mls qos trust cos

E.

mls qos trust dscp

 

Correct Answer: A

Explanation:

The mls qos cos override interface command must be used to ensure that untrusted CoS values are explicitly set 0 (default).

Reference:

http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoSSRND-Book/QoSDesign.html

 

 

QUESTION 550

While troubleshooting an issue for a remote user, you must capture the communication between the user’s computer and a server at your location. The traffic passes through a Cisco IOS-XE capable switch. Which statement about obtaining the capture is true?

 

A.

The Embedded Packet Capture application in the IOS-XE Software can capture the packets, but there is a performance impact.

B.

The Embedded Packet Capture application in the IOS-XE Software can capture the packets without impacting performance.

C.

The Mini Protocol Analyzer embedded in the IOS-XE Software can capture the packets without impacting performance.

D.

The Mini Protocol Analyzer embedded in the IOS-XE Software can be used to capture the packets, but there is a performance impact.

E.

Wireshark can capture packets through a SPAN port, but there is a performance impact.

 

Correct Answer: A

 

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