Ensurepass

CCIE Routing and Switching Written Exam v5.1

 

QUESTION 111

Refer to the exhibit. How many EIGRP routes will appear in the routing table of R2?

 

clip_image002

 

A.

0

B.

1

C.

2

D.

3

 

Correct Answer: A

Explanation:

EIGRPv6 on R2 was shut down so there is no EIGRP routes on the routing table of R2. If we turn on EIGRPv6 on R2 (with “no shutdown” command) then we would see the prefix of the loopback interface of R1 in the routing table of R2.

 

 clip_image004

 

Note: EIGRPv6 requires the “ipv6 unicast-routing” global command to be turned on first or it will not work.

 

 

QUESTION 112

Which two statements are true about IPv6 multicast? (Choose two.)

 

A.

Receivers interested in IPv6 multicast traffic use IGMPv6 to signal their interest in the IPv6 multicast group.

B.

The PIM router with the lowest IPv6 address becomes the DR for the LAN.

C.

An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8.

D.

The IPv6 all-routers multicast group is FF02:0:0:0:0:0:0:2.

 

Correct Answer: CD

Explanation:

Multicast addresses in IPv6 have the prefix ff00::/8.

Well-known IPv6 multicast addresses

Address

Description

ff02::1

All nodes on the local network segment

ff02::2

All routers on the local network segment

Reference: http://en.wikipedia.org/wiki/Multicast_address

QUESTION 113

Refer to the exhibit. Which VLANs are permitted to send frames out port FastEthernet0/1?

 

clip_image006

 

A.

100 – 200

B.

4 – 100

C.

1 and 4 – 100

D.

3 and 4 – 100

 

Correct Answer: D

Explanation:

Traffic on the native vlan does not get tagged as it crosses a trunk, so there is no dot1q tag in the first place to be filtered. And you don’t need to allow the native vlan. But if we force to tag the native vlan (with the “switchport trunk native vlan tag” command) then if the native vlan is not in the “allowed vlan” list it will be dropped.

 

 

QUESTION 114

Which two options are advantages of NetFlow version 9 over NetFlow version 5? (Choose two.)

 

A.

NetFlow version 9 adds support for IPv6 headers.

B.

NetFlow version 9 adds support for MPLS labels.

C.

NetFlow version 9 adds support for the Type of Service field.

D.

NetFlow version 9 adds support for ICMP types and codes.

 

Correct Answer: AB

Explanation:

NetFlow version 9 includes support for all of these fields that version 5 supports and can optionally include additional information such as Multiprotocol Label Switching (MPLS) labels and IPv6 addresses and ports.

 

 

QUESTION 115

Refer to the exhibit. Which two statements are true? (Choose two.)

 

clip_image008

 

A.

This is the output of the show ip ospf command.

B.

This is the output of the show ip protocols command.

C.

This router is an ABR.

D.

This router is an ASBR.

E.

Authentication is not configured for the area.

 

Correct Answer: AE

Explanation:

The following is sample output from the show ip ospf command when entered without a specific OSPF process ID with no authentication

Router# show ip ospf

 

Routing Process “ospf 201” with ID 10.0.0.1 and Domain ID 10.20.0.1

Supports only single TOS(TOS0) routes

Supports opaque LSA

SPF schedule delay 5 secs, Hold time between two SPFs 10 secs

Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs

LSA group pacing timer 100 secs

Interface flood pacing timer 55 msecs

Retransmission pacing timer 100 msecs

Number of external LSA 0. Checksum Sum 0x0

Number of opaque AS LSA 0. Checksum Sum 0x0

Number of DCbitless external and opaque AS LSA 0

Number of DoNotAge external and opaque AS LSA 0

Number of areas in this router is 2. 2 normal 0 stub 0 nssa

External flood list length 0

Area BACKBONE(0)

Number of interfaces in this area is 2

Area has no authentication

SPF algorithm executed 4 times

Area ranges are

Number of LSA 4. Checksum Sum 0x29BEB

Number of opaque link LSA 0. Checksum Sum 0x0

Number of DCbitless LSA 3

Number of indication LSA 0

Number of DoNotAge LSA 0

Flood list length 0

 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/command/iro-cr-book/ospf-s1.html#wp8749965360

 

 

QUESTION 116

Refer to the exhibit. Which two statements about the output are true? (Choose two.)

 

clip_image009

 

A.

802.1D spanning tree is being used.

B.

Setting the priority of this switch to 0 for VLAN 1 would cause it to become the new root.

C.

The hello, max-age, and forward delay timers are not set to their default values.

D.

Spanning-tree PortFast is enabled on GigabitEthernet1/1.

 

Correct Answer: AB

Explanation:

802.1D is the standard for Spanning tree, which is being used here. For priority, The priority order starts from 0 (yes, 0 is valid) and then increases in 4096.

0, 4096, 8192, 12288, …. Etc.

The lower the number, the higher the priority. Here we see that the current root has a priority of 8192, so configuring this with a priority of 0 will make it the new root.

 

 

QUESTION 117

Refer to the exhibit. What is the PHB class on this flow?

 

clip_image011

 

A.

EF

B.

none

C.

AF21

D.

CS4

 

Correct Answer: D

Explanation:

This command shows the TOS value in hex, which is 80 in this case. The following chart shows some common DSCP/PHB Class values:

 

Service

DSCP value

TOS value

Juniper Alias

TOS hexadecimal

DSCP – TOS Binary

Premium IP

46

184

ef

B8

101110 – 101110xx

LBE

8

32

cs1

20

001000 – 001000xx

DWS

32

128

cs4

80

100000 – 100000xx

Network control

48

192

cs6

c0

110000 – 110000xx

Network control 2

56

224

cs7

e0

111000 – 111000xx

 

Reference: http://www.tucny.com/Home/dscp-tos

 

 

QUESTION 118

Refer to the exhibit. Which two statements are true about the displayed STP state? (Choose two.)

 

clip_image013

 

A.

The STP version configured on the switch is IEEE 802.1w.

B.

Port-channel 1 is flapping and the last flap occurred 1 minute and 17 seconds ago.

C.

The switch does not have PortFast configured on Gi0/15.

D.

BPDUs with the TCN bit set are transmitted over port channel 1.

 

Correct Answer: CD

Explanation:

A port enabled with portfast will not send topology changes when a port goes up or down, but here we see that 296 TCN’s were sent so we know that Gi 0/15 does not have portfast enabled. TCN’s are sent using BPDU’s over the root port, which we see is port channel 1.

 

 

QUESTION 119

Which Carrier Ethernet service supports the multiplexing of multiple point-to-point EVCs across as a single UNI?

 

A.

EPL

B.

EVPL

C.

EMS

D.

ERMS

 

Correct Answer: B

Explanation:

Ethernet Relay Service (ERS or EVPL)

An Ethernet Virtual Circuit (EVC) is used to logically connect endpoints, but multiple EVCs could exist per single UNI. Each EVC is distinguished by 802.1q VLAN tag identification. The ERS network acts as if the Ethernet frames have crossed a switched network, and certain control traffic is not carried between ends of the EVC. ERS is analogous to Frame Relay where the CE-VLAN tag plays the role of a Data-Link Connection Identifier (DLCI). The MEF term for this service is EVPL.

Reference: http://www.cisco.com/c/en/us/td/docs/net_mgmt/ip_solution_center/5-1/carrier_ethernet/user/guide/l2vpn51book/concepts.html

 

 

QUESTION 120

Refer to the exhibit. Video Source S is sending interactive video traffic to Video Receiver R. Router R1 has multiple routing table entries for destination R. Which load-balancing mechanism on R1 can cause out-of-order video traffic to be received by destination R?

 

clip_image015

 

A.

per-flow load balancing on R1 for destination R

B.

per-source-destination pair load balancing on R1 for destination R

C.

CEF load balancing on R1 for destination R

D.

per-packet load balancing on R1 for destination R

 

Correct Answer: D

Explanation:

Per-packet load balancing guarantees equal load across all links, however potentially the packets may arrive out-of-order at the destination as differential delay may exist within the network.

Reference: http://www.cisco.com/en/US/products/hw/modules/ps2033/prod_technical_reference09186a00800 afeb7.html

 

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