Download New Updated (Spring 2015) Cisco 350-029 Actual Tests 21-30

By | April 26, 2015

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QUESTION 21

What bit should be set in the link state PDUs in an IS-IS level-1-2 router to indicate that they are a potential exit point out of the area?

 

A.

ATT (Attached) bit

B.

ABR (Area Border Rorter) bit

C.

PN (Pseudonode) bit

D.

P (Partition) bit

E.

Down bit

F.

IS-Type bit

 

Correct Answer: A

 

 

QUESTION 22

The Attribute field within the IS-IS LSP header contains which of the following flags? (Choose four)

 

A.

IS-Type

B.

Overload (LSPDBOL)

C.

Pseudonode (PN)

D.

Attached (ATT)

E.

Fragment (Frag-Nr)

F.

Partition (P)

 

Correct Answer: ABDF

Explanation:

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Partition Repair (P): Although this bitexists in both L1 and L2 LSPs, it is relevant only in L2 LSPs. When this bit is set to 1, it indicates that the originating router supports the automatic repair of area partitions. Cisco IOS does not support this feature; it always originates LSPs with theP bit set to 0.

 

Attachment (ATT): A 4-bit field indicating whether the originating router is attached to one or more areas.

 

Although this bit exists in both L1 and L2 LSPs, it is relevant only in L1 LSPs originated by L1/L2 routers to indicate that it is also a L2 router, which is a potential exit to reach other areas. Reading from left to right (bits 7 – 4), the bits indicate the Error metric, the Expense metric, theDelay metric, and the Default metric. Cisco IOSsupports only the default metric, so bits 5 – 7 are always 0.

 

Overload (OL): The Link-State Database Overload bit. This bit is often set to 0. A router set this bit on its LSPs when unable to store the entire LSDB. Routers receiving an LSP with the OL bit set will not use the originating routeras a transit router as its routing table is incomplete, which may result in suboptimal routing and even routing loops; but they will still forward packets destined to the directly connected networks or interfaces of the originating router.

IS Type A 2-bitfield indicating whether the originating router is an L1 or L2 IS.

01 – L1; 11 – L2; 00 and 10 are unused values.

An L1/L2 router sets the bits accordingly upon its L1 and L2 LSPs.

 

 

QUESTION 23

Refer to the exhibit. Your customer has enabled IPv6 andIPv4 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.

EnableOSPFv3 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 24

What ISIS TLVs are used to support MPLS Traffic Engineering? (Choose three).

 

A.

Extended IS neighbor TLV #22

B.

Extended IS name TLV #137

C.

Extended IS resource TLV#138

D.

Extended IS reachability TLV #135

E.

Router ID TLV #134

 

Correct Answer: ADE

Explanation:

TLV Name Description

1 Area Address Includes the Area Addresses to which the Intermediate System is connected.

2 IIS Neighbors Includes all the IS-ISs running interfaces to which the router is connected.

8 Padding Primarily used in the IS-IS Hello (IIH) packets to detect the maximum transmission unit (MTU) inconsistencies. By default, IIH packets are padded to the fullest MTU of the interface.

10 Authentication The informationthat is used to authenticate the PDU, 22 TE IIS Neighbors Increases the maximum metric to three bytes (24 bits). Known as the Extended IS

Reachability TLV, this TLV addresses a TLV 2 metric limitation. TLV 2 has a maximum metric of 63, but only six out ofeight bits are used.

128 IP Int. Reachability Provides all the known IP addresses that the given router knows about via one or more internally-originated interfaces. This information may appear multiple times.

129 Protocols Supported Carries the Network Layer Protocol Identifiers (NLPID) for Network Layer protocols that the IS (Intermediate System) is capable. It refers to the Data Protocols that are supported. For example, IPv4 NLPID value 0xCC, CLNS NLPID value 0x81, and/or IPv6 NLPID value 0x8E will beadvertised in this NLPID TLV.

130 IP Ext. Address Provides all the known IP addresses that the given router knows about via one or more externally-originated interfaces. This information may appear multiple times.

132 IP Int. Address The IP interface address that is used to reach the next-hop address.

134 TE Router ID This is the Multi-Protocol Label Switching (MPLS) traffic engineering router ID.

135 TE IP Reachability Provides a 32 bit metric and adds a bit for the “up/down”resulting from the routeleaking of L2->L1. Known as the Extended IP Reachability TLV, this TLV addresses the issues with both TLV 128 and TLV 130.

137 Dynamic Hostname Identifies the symbolic name of the router originating the link-state packet (LSP).

10 and 133 TLV 10 should be used for Authentication; not the TLV 133. If TLV 133 is received, it is ignored on receipt, like any other unknown TLVs. TLV 10 should be accepted for authentication only.

 

 

QUESTION 25

How do routers in an IS-IS Level-1 domainexit to reach other Level-1 domains? (Choose two.)

 

A.

Level-1 routers use default routes announced by Level-2 routers in Level-1 domain

B.

Level-1 routers use default routes installed based on ATT bit (Attach Bit) in announcements from Level-1-2 router

C.

Level-1 routers use specific routes, for other Level-1 domain, announced by Level-1-2 rou
ter by route leaking feature of Cisco IOS

D.

Level-1 routers use specific routes, for other Level-1 domain, announced by Level-2 router by route-leaking feature of Cisco IOS

 

Correct Answer: BC

 

 

QUESTION 26

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 27

What is periodically multicasted (every 10 seconds) by the DIS on a LAN toensure IS-IS Link State Database accuracy?

 

A.

IIH

B.

LSP

C.

CSNP

D.

ISH

E.

PSNP

 

Correct Answer: C

Explanation:

On broadcast networks, designated routers send complete sequence number PDU (CSNP) packets to maintain database synchronization. The CSNP interval timer is thenumber of seconds between transmissions of CNSP packets from this interface.

 

 

QUESTION 28

Which two statements regarding the IS-IS DIS election process are true? (Choose two.)

 

A.

L1 routers on a broadcast network only establish adjacencies with the DIS.

B.

If the DIS becomes unavailable the backup DIS is promoted to DIS.

C.

Adding a router with a higher priority than the current DIS will result in the new router becoming DIS.

D.

Separate L1 and L2 election processes are held on a brodcast network.

E.

A priority of 0 will prevent a router from becoming a DIS.

F.

If there is a tie based on priority, the router whose attached interface has the lowest MACaddress becomes the DIS.

 

Correct Answer: CD

Explanation:

Election of the DIS

On a LAN, one of the routers elects itselfthe DIS, based on interface priority (the default is 64). If all interface priorities are the same, the rou
ter with the highest subnetwork point of attachment (SNPA) is selected. The SNPA is the MAC address on a LAN, and the local data link connection identifier (DLCI) on a Frame Relay network. If the SNPA is a DLCI and is the same at both sides of a link, the router with the higher system ID becomes the DIS. Every IS-IS router interface is assigned both a L1 priority and a L2 priority in the range from 0to 127.

The DIS election is preemptive (unlike OSPF). If a new router boots on the LAN with a higher interface priority, the new router becomes the DIS. It purges the old pseudonode LSP and floods a new set of LSPs.

 

 

 

 

 

 

 

 

 

 

 

 

 

QUESTION 29

DRAG DROP

Drag theISIS packet types to correct type definition.

 

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Correct Answer:

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QUESTION 30

What is the importance of using Virtual Output Queues on ingress Line Cards in a high-end router?

 

A.

Increases forwarding performance

B.

Simplifies configuration

C.

Prevents head-of-line blocking

D.

Uses less memory

 

Correct Answer: C

 

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