Download New Updated (Spring 2015) Cisco 350-029 Actual Tests 51-60

Ensurepass

 

QUESTION 51

Which four of these are MPLS label header fields? (Choose four.)

 

A.

Label

B.

VPI VCI

C.

EXP

D.

TTL

E.

FCS

F.

S flag

 

Correct Answer: ACDF

 

 

QUESTION 52

Based on the following output in a router A running LDP, which statement is true?

 

ROUTER-A#show mpls ldp bindings 50.0.0.1 32

 

lib entry: 50.0.0.1/32, rev 5

 

local binding. label: imp-null

 

remote binding.lsr: 50.0.0.4:0, label: 16

 

A.

None of the above.

B.

The IP address 50.0.0.1/32 is assigned to the non-directly connected LDP neighbor, 50.0.0.4.

C.

The IP address 50.0.0.1/32 is assigned to one of its own interfaces.

D.

The IP address 50.0.0.1/32 is assigned to its directly connected LDP neighbor, 50.0.0.4.

 

Correct Answer: C

 

 

QUESTION 53

Which three statements about MPLS Label Distribution Protocol (LDP) are valid?

 

A.

LDP hello packets are sent to UDP port 646

B.

LDP hello packets are sent to TCP port 711

C.

LDP sessions are TCP sessions to port 646

D.

LDP sessions are TCP sessions to port 711

E.

LDP establishes a peer relationship with another router that must be directly attached.

F.

LDP can establishes a peer relationship with another router that is notdirectly attached

 

Correct Answer: ACF

 

 

 

QUESTION 54

Which option describes the incorrect usage of the Label Distribution method?

 

A.

MP-BGP is used for label distribution for VPN customer routes.

B.

LDP is primarily used in internal networks of MPLS-VPNproviders.

C.

MP-BGP is used for label distribution in MPLS Traffic Engineered networks.

D.

Directed LDP is used for label distribution in L2-VPN Attachement Circuits.

 

Correct Answer: C

 

 

QUESTION 55

Which four services use the inner labels of an MPLS label stack? (Choose four)

 

A.

MPLS VPN

B.

switching path in MPLS core

C.

Cisco MPLS Traffic Engineering and Fast Reroute

D.

MPLS over ATM

E.

VPN over Traffic Engineering core

F.

any transport over MPLS

 

Correct Answer: ACEF

 

 

QUESTION 56

Which 4 statementsregarding 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 backonto 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 specifiedin the Label Distribution Protocol, so a value is reserved.

 

 

QUESTION 57

The mechanisms for distributing LDP are:

 

A.

CEF and the FIB table

B.

UDP and IP

C.

A and B

D.

RSVP and CEF

E.

LDP and RSVP

 

Correct Answer: E

 

 

QUESTION 58

Based on the followingoutput 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 andthe 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 labelis replaced with label 17 and the packet is sent out on the Ethernet 0/0 interface.

 

Correct Answer: D

 

 

QUESTION 59

What is the encapsulation mode for MPLS running on Ethernet?

 

A.

Transparent mode.

B.

Frame mode

C.

Channel mode

D.

Packet mode.

E.

Tunnelmode.

 

Correct Answer: B

 

 

 

 

 

 

QUESTION 60

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

 

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