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CCIE Service Provider Written Exam v4.1

QUESTION 1

LDP uses which two components to discover neighbors on a network segment. (Choose two)

 

A.

224.0.0.1 multicast address

B.

224.0.0.14 multicast address

C.

711 udpport

D.

224.0.0.2 multicast address

E.

646 tcpport

F.

711 tcpport

G.

646 udp port

 

Correct Answer: DG

 

 

QUESTION 2

R3 and R4 are Route-Reflectors and there is an iBGP session between them, there is NO iBGP session between R1 and R2. For an External Route from CE-2 in R2 to reach R1, which two statements are true?

 

clip_image002

 

A.

R1, R3 and R4 establish full mesh iBGP sessions, R2, R3 and R4 establish full mesh iBGP sessions.

B.

R1 acts as a Route-Reflector client to R3, R2 acts as a Route-Reflector client to R4.

C.

R1 acts as a Route-Reflector client to R4, R4 acts as a Route-Reflector client to R3, R2 acts as a Route-Reflector client to R3.

D.

CE-2 establishes multi-hop E-BGP sessions with R3 and R4.

 

Correct Answer: BC

 

 

QUESTION 3

Which Cisco IOS command must be applied to create a multiprotocol VRF?

 

A.

ip vrf

B.

ip vrf forwarding

C.

vrf definition

D.

vrf downgrade-cli

E.

vrf forwarding

 

Correct Answer: C

 

 

QUESTION 4

Refer to exhibit. NAT64 stateless configuration has been applied on RT1 router. The NAT64 prefix stateless used on this scenario is 2001:DB8:2::/96. `Host IPv4 only’ needs to test the connectivity with `Host IPv6 only’ using a ping command. Which is the correct ping command `Host IPv4 only’ should use?

 

clip_image004

 

A.

ping 27.1.1.10

B.

ping 27.1.1.10 source 2001:db8:2::7001:10A

C.

ping 2001:db8:2::7001:10A

D.

ping 2001:db8:2::112.1.1.10

E.

ping 2001:db8:2::27.1.1.10

F.

ping 2001:db8:2::1B01:10A

 

Correct Answer: A

 

 

QUESTION 5

The following congestion avoidance configuration has been applied on an outgoing interface:

 

policy-map COS-OUTclass DATA

 

random-detect dscp-based

 

random-detect exponential-weighting-constant 9random-detect dscp 26 39 117 30random- detect dscp 28 19 35 20

 

Which is the result of the egress packets marked as DSCP AF32 when the average queue depth is 40?

 

A.

It will be dropped with a random rate less than the one defined by MPD.

B.

It will be tail dropped.

C.

It will be dropped with a rate of 1 packet out of 30.

D.

D.It will be dropped with a rate of 1 packet out of 20.

Correct Answer: D

Explanation:

AF32 = DSCP28. Random detect has default minimum threshold of 20 packets.

 

 

QUESTION 6

A router is able to assign labels to the prefixes and MPLS is enabled on all of the router interfaces. However, this router is unable to establish an LDP session with its LDP neighbors. What could be the cause of this problem?

 

A.

ip cefis not enabled.

B.

mpls ip is missing in the global configuration mode.

C.

The LDP router ID is unreachable.

D.

LIB has no label.

 

Correct Answer: C

 

 

QUESTION 7

An engineer is troubleshooting L3VPN traffic loss over the MPLS-enabled core network when new core links were enabled. Assuming that the IGP is properly configured, which issue causes a temporary data flow blackholing when the IGP and LDP reconvenes?

 

A.

LDP is a Layer 2 protocol forwarding label packets before the IGP reconvened.

B.

IP packets are forwarded as soon as routes are learned over a new IGPadjacency before the label exchange happens over the new links

C.

MP-BGP sessions between PE and RR routers require extra time to reconverge than the underlying IGP.

D.

MPLS-TE tunnels without LDP adjacencies are used over the new links black-holing the traffic before the LDP label exchange is completed

 

Correct Answer: B

 

 

QUESTION 8

Which QoS DiffServ mode preserves the original customer IP marking besides of on egress PE router uses the DSCP value of this IP packet on outbound queuing?

 

A.

MPLS PHB mode

B.

Pipe mode

C.

IntServ mode

D.

Uniform mode

E.

Short-Pipe mode

 

Correct Answer: E

Explanation:

Pipe mode marks the packet based on the EXP value vs short-pipe mode does it based on DSCP

 

 

QUESTION 9

Which OSPF feature allows the router to recompute SPF changes for only the affected part of the SPT?

 

A.

PRC

B.

fast hellos

C.

BFD across the entire backbone area

D.

incremental SPF

 

Correct Answer: D

 

 

QUESTION 10

A service provider is considering investing in SP chaining solution , which 3 services can be recommended?

 

A.

Firewall

B.

vxlan

C.

CGNAT

D.

WAAS

E.

E-Mail

F.

Authoritative DNS

 

Correct Answer: ACD

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