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CCIE Routing and Switching Written Exam v5.1

QUESTION 681

When STP UplinkFast is enabled on a switch utilizing the default bridge priority, what will the new bridge priority be changed to?

 

A.

8192

B.

16384

C.

49152

D.

65535

 

Correct Answer: C

 

 

QUESTION 682

Which of these best describes the actions taken when a VTP message is received on a switch configured with the VTP mode “transparent”?

 

A.

VTP updates are ignored and forwarded out all ports.

B.

VTP updates are ignored and forwarded out trunks only.

C.

VTP updates are made to the VLAN database and are forwarded out trunks only.

D.

VTP updates are ignored and are not forwarded.

 

Correct Answer: B

 

 

QUESTION 683

Refer to the exhibit. In this network, R1 has been configured to advertise a summary route, 192.168.0.0/22, to R2. R2 has been configured to advertise a summary route, 192.168.0.0/21, to R1. Both routers have been conf
igured to remove the discard route (the route to null created when a summary route is configured) by setting the administrative distance of the discard route to 255. What will happen if R1 receives a packet destined to 192.168.3.1?

 

clip_image001

 

A.

The packet will loop between R1 and R2.

B.

It is not possible to set the administrative distance on a summary to 255.

C.

The packet will be forwarded to R2, where it will be routed to null0.

D.

The packet will be dropped by R1, since there is no route to 192.168.3.1.

 

Correct Answer: A

 

 

QUESTION 684

Refer to the exhibit. In this network, R1 is configured not to perform autosummarization within EIGRP. What routes will R3 learn from R2 through EIGRP?

 

clip_image002

 

A.

172.30.1.0/24 and 10.1.2.0/24; EIGRP only performs autosummarization at the edqe between two major networks.

B.

172.30.0.0/16 and 10.1.2.0/24; R2 will perform autosummarization, although R1 will not.

C.

Since R2 is configured without autosummarization, it will not propagate the 172.30.1.0/24 route.

D.

172.30.0.0/8 and 10.0.0.0/8

 

Correct Answer: A

 

 

QUESTION 685

The classic Spanning Tree Protocol (802.1 D 1998) uses which sequence of variables to determine the best received BPDU?

 

A.

1) lowest root bridge id, 2) lowest sender bridge id, 3) lowest port id, 4) lowest root path cost

B.

1) lowest root path cost, 2) lowest root bridge id, 3) lowest sender bridge id, 4) lowest sender port id

C.

1) lowest root bridge id, 2) lowest sender bridge id, 3) lowest root path cost 4) lowest sender port id

D.

1) lowest root bridge id, 2) lowest root path cost, 3) lowest sender bridge id, 4) lowest sender port id

 

Correct Answer: D

 

< font face="Arial"> 

QUESTION 686

Which three port states are used by RSTP 802.1w? (Choose three.)

 

A.

Listening

B.

Learning

C.

Forwarding

D.

Blocking

E.

Discarding

F.

Disabled

Correct Answer: BCE

 

 

QUESTION 687

Refer to the exhibit. Catalyst R is the root bridge for both VLAN 1 and VLAN 2. What is the easiest way to load-share traffic across both trunks and maintain redundancy in case a link fails, without using any type of EtherChannel link-bundling?

 

clip_image003

 

A.

Increase the root bridge priority (increasing the numerical priority number) for VLAN 2 on Catalyst D so that port D2 becomes the root port on Catalyst D for VLAN 2.

B.

Decrease the port priority on R2 for VLAN 2 on Catalyst R so that port D1 will be blocked for VLAN 2 and port D2 will remain blocked for VLAN 1.

C.

Decrease the path cost on R2 on Catalyst R for VLAN 2 so that port D1 will be blocked for VLAN 2 and port D2 will remain blocked for VLAN 1.

D.

Increase the root bridge priority (decreasing the numerical priority number) for VLAN 2 on Catalyst R so that R2 becomes the root port on Catalyst D for VLAN 2.

 

Correct Answer: B

 

 

QUESTION 688

Refer to the exhibit. In the diagram, the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state?

 

clip_image004

 

A.

GE-1/2andGE2/1

B.

GE-1/1 and GE-2/2

C.

GE-3/2 and GE 4/1

D.

no ports are in the blocking state

E.

There is not enough information to determine which ports are in the blocking state.

 

Correct Answer: A

 

 

QUESTION 689

Refer to the exhibit. In the diagram, the switches are running IEEE 802.1 w RSPT. On which ports should root guard be enabled in order to facilitate deterministic root bridge election under normal and failure scenarios?

 

clip_image005

 

A.

GE-3/1, GE-3/2

B.

FE-2/1, FE-3/2

C.

GE-1/1.GE-1/2

D.

GE-4/1, GE-4/2

E.

GE-2/1, GE-2/2

F.

GE-3/1, GE-3/2, GE-4/1, GE-4/2, FE-2/1, FE-3/2

 

Correct Answer: F

 

 

QUESTION 690

Loop guard and UniDireclional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention? (Choose two.)

 

A.

Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot.

B.

UDLD protects against STP failures caused by cabling problems that create one-way links.

C.

Loop guard detects and protects against duplicate packets being received and transmitted on different ports.

D.

UDLD protects against unidirectional cabling problems on copper and fiber media.

E.

Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.

 

Correct Answer: BE

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