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CCIE Routing and Switching (v5.1)

Question No: 61 – (Topic 1)

Which feature must be enabled so that an IS-IS single topology can support IPv6 traffic?

1. extended metrics

2. adjacency checking

3. new-style TLVs only

4. both new-and old-style TLVs

5. old-style TLVs only

Answer: C

Question No: 62 – (Topic 1)

Under which two circumstances is IPsec transport mode appropriate ? (Choose two)

1. When both hosts are behind IPsec peers.

2. When the hosts are transmitting router management traffic.

3. When only one host is behind an IPsec peer.

4. When only IP header encryption is needed.

5. When IPsec peers are the source and the destination of the traffic.

6. When only IP header authentication is needed.

Answer: B,E

Question No: 63 – (Topic 1)

Which IPv6 migration method allows IPv4-only devices to communicate with IPv6-only devices?

1. Dual stack

2. NAT64

3. ISATAP tunnel

4. GRE tunnel

Answer: B

Question No: 64 – (Topic 1)

Exhibit:

Which option describes the meaning of this console message?

1. An EIGRP hold timer has expired.

2. FastEthernetO/O has interface errors.

3. An EIGRP process has been shut down.

4. An interface has gone down.

Answer: C

Question No: 65 – (Topic 1)

Which two options are potential impacts of microbursts? (Choose two.)

1. invalid checksum

2. tail drops

3. packet loss

4. unicast flooding

5. asymmetric routing

6. unnecessary broadcast traffic

Answer: B,C

Question No: 66 – (Topic 1)

Refer to the exhibit .

If R1 generated this response to the show debug command, which statement about its debug its debug output is true?

1. As soon as interface Fa0/0 becomes active, it generate debug output because one condition has been met.

2. When debug output is generated, only the user Cisco is permitted to view it.

3. R1 generates debug output as soon as IP address 192.168.0.0 is applied to interface Fa0/0.

4. RI generates debug output as soon as all three conditions are met.

Answer: A

Question No: 67 – (Topic 1)

Which IS-IS process is responsible for flooding local link information to adjacent routers ?

1. decision

2. receive

3. forward

4. update

Answer: D

Question No: 68 – (Topic 1)

Refer to the exhibit.

Which statement describes how a router with this configuration treats packets if the devices at 172.16.12.5 and 192.168.3.2 are unreachable ?

1. It routes the packet using the default routing table.

2. It routers the packet into a loop and drops it when the TTL reaches zero.

3. It drop the packet immediately.

4. It sends an ICMP source quench message.

Answer: A

Question No: 69 – (Topic 1)

Which three statements about AToM are true?(Choose three)

1. It requires Layer 3 routing between the PE and CE router.

2. It supports interworking for Frame Relay,PPP,andEthernet,but not ATM

3. It requires MPLS between the PE routers

4. The attachment circuit is configured with the xconnectcommand

5. IP CEF should be disabled in the PE routers.

6. The PE routers must share the same VC idenifier.

Answer: B,C,F

Question No: 70 – (Topic 1)

Which type of port would have root guard enabled on it

1. a designated port

2. an alternate port

3. a blocked port

4. a root port

Answer: A

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