[Free] Download New Latest (November) Cisco 400-201 Actual Tests 91-100

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QUESTION 91

Which two statements about forwarding equivalence class (FEC) are true? (Choose two)

 

A.

FEC might correspond to a destination IP subnet, but it might also correspond to any traffic class that the edge LSR considers significant.

B.

FEC is a group of IP packets that is forwarded over a different path, but with the same forwarding treatment.

C.

FEC is a group of IP packets that is forwarded over the same path, and with the same forwarding treatment.

D.

FEC is a group of IP packets that is forwarded over a different path, but with the different forwarding treatment.

E.

FEC is a group of IP packets that is forwarded over the same path, but with a different forwarding treatment.

 

Correct Answer: AC

 

 

QUESTION 92

In the IS-IS Designated Intermediate System (DIS) election process, which criteria is used for DIS selection?

 

A.

highest router ID first, then highest priority

B.

highest MAC address first, then highest priority

C.

highest router ID first, then highest MAC address

D.

highest priority first, then highest router ID

E.

highest priority first, then highest MAC address

 

Correct Answer: E

 

 

QUESTION 93

What best explains the BGP route-reflector function?

 

A.

None of the above.

B.

BGP route-reflector does not have to be in the forwarding path of data coming from its clients.

C.

BGP route-reflector will stop reflecting the routes if they’re not directly-connected clients.

D.

BGP route-reflector should be in forwarding path of data coming from its clients.

 


Correct Answer:
B

 

 

QUESTION 94

Which description of BGP authentication is true?

 

A.

MD5 has been used by BGP to encrypt BGP update packets.

B.

BGP uses a message-digest algorithm to authenticate BGP peers

C.

A plain-text password authentication is an option of BGP authentication

D.

EBGP peers authentication is faster than IBGP peers authentication

E.

BGP uses public key and private key to authenticate BGP peers.

 

Correct Answer: B

Explanation:

BGP Authentication

BGP supports MD5 authentication between neighbors, using a shared password. It is configured under BGP router configuration mode with the command neighbor {ip-address | peer-group-name} password password.

When authentication is configured, BGP authenticates every TCP segment from its peer and checks the source of each routing update. Most ISPs require authentication for their EBGP peers.

 

 

QUESTION 95

Which of the following events can NOT be tuned via router configuration to provide for faster convergence following a link failure?

 

A.

Failure detection

B.

IGP LSP/LSA origination

C.

Per-hop flooding time of new link state

< p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: normal; text-autospace: ; mso-layout-grid-align: none" align="left">D.

Number of hops that need to be notified of new link state

E.

Failure reporting

 

Correct Answer: D

 

 

QUESTION 96

In optical channel transport unit overhead (OTU OH), what are general communication channels 1 and 2 (GCC1/GCC2) used for?

 

A.

for trail trace identification

B.

as the backward defect indicator

C.

to transmit information between OTU termination points

D.

to extend command and management functions over several frames

E.

General communication channels 1 and 2 (GCC1/GCC2) do not belong to OTU OH.

 

Correct Answer: E

Explanation:

OTU overhead:

The OTU overhead consists of three bytes for section monitoring (SM), a two-byte general communications channel (GCC0), and two bytes reserved for future international standardization.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 97

Refer to the exhibit. Your customer has enabled IPv6 and IPv4 on routers R1 and R2, both running ISIS routing protocol, and they can no longer reach R3 network 172.26.15.0/24 (R3 does not enable IPv6, enables IPv4 only). Which two steps should be taken to restore reach ability to R3? (Choose two.)

 

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A.

Enable OSPFv3 to support IPv4 and IPv6 simultaneously.

B.

Configure static routes to all unreachable networks and redistribute to IS-IS.

C.

Create an IPv6 tunnel from R2 to R3.

D.

Transition
to IS-IS Multiple Topology Mode on R3.

E.

Enable wide metrics.

F.

Transition to IS-IS Multiple Topology Mode on R1 and R2.

 

Correct Answer: EF

 

 

QUESTION 98

What IOS commands display MPLS label mapping on an LSR?

 

A.

Show mpls ldp parameters

B.

Show mpls ldp bindings

C.

Show mpls forwading-table

D.

Show mpls ldp discovery

E.

Show mpls ldp neighbor detail

 

Correct Answer: B

 

 

QUESTION 99

Based on the following output in R1, which statement is true.

 

R1#show mpls forwarding-table 50.0.0.3 detail

 

Local Outgoing Prefix Bytes Label Outgoing Next Hop

Label Label or Tunnel Id Switched interface

19 17 50.0.0.3/32 0 Et0/0 192.168.0.14

 

A.

If a labeled packet arrives with the topmost label of 17, all the labels will be removed and a clear IP packet is sent to Next Hop 192.168.0.14 on Ethernet 0/0.

B.

If a labeled packet arrives with the topmost label of 17, the label is replaced with label 19 and the packet is sent out on the Ethernet 0/0 interface.

C.

If a labeled packet arrives with the topmost label of 19, the label is replaced with label 17 and the packet is sent out on the Ethernet 0/1 interface.

D.

If a labeled packet arrives with the topmost label of 19, the label is replaced with label 17 and the packet is sent out on the Ethernet 0/0 interface.

 

Correct Answer: D

 

 

QUESTION 100

Which 4 statements regarding MPLS Label Stack Encoding is true?

 

A.

A value of 4 represents the “Implicit NULL Label.”

B.

A value of 0 represents the “IPv4 Explicit NULL Label.”

C.

A value of 1 represents the “Router Alert Label”.

D.

A value of 2 represents the “IPv6 Explicit NULL Label”

E.

A value of 1 represents the “IPv1 Explicit NULL Label”

F.

A value of 3 represents the “Implicit NULL Label”

 

Correct Answer: BCDF

Explanation:

A value of 0 represents the “IPv4 Explicit NULL Label”. This label indicates that the label stack must be popped, and the packet forwarding must be based on the IPv4 header. This helps to keep Exp bits safe until the egress router. It is used in MPLS based QoS.

A value of 1 represents the “Router Alert Label”. When a received packet contains this label value at the top of the label stack, it is delivered to a local software module for processing. The actual packet forwarding is determined by the label beneath it in the stack. However, if the packet is forwarded further, the Router Alert Label should be pushed back onto the label stack before forwarding. The use of this label is analogous to the use of the “Router Alert Option” in IP packets (for example, ping with record route option)

 

A value of 2 represents the “IPv6 Explicit NULL Label”. It indicates that the label stack must be popped, and the packet forwarding must be based on the IPv6 header. A value of 3 represents the “Implicit NULL Label”. This is a label that an LSR can assign and distribute.

However, it never actually appears in the encapsulation. It indicates that the LSR pops the top label from the stack and forwards the rest of the packet (labeled or unlabeled) through the outgoing interface (as per the entry in Lfib). Although this value might never appear in the encapsulation, it needs to be specified in the Label Distribution Protocol, so a value is reserved.

 

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