350-501 Networking Practice Test 11 — 15 Questions

Question 1

Which IS-IS TLV is used to carry IPv6 reachability information?

Accepted Answer

TLV 236. TLV 236 (IPv6 Reachability) carries IPv6 prefixes and associated metrics.

Answer

TLV 135

Answer

TLV 232

Answer

TLV 242

Question 2

In OSPF Traffic Engineering (TE) extensions for RSVP-TE, which LSA type is used to carry TE information?

Accepted Answer

Type 10 LSA. Opaque LSA Type 10 (area-scoped) is used for OSPF TE, containing sub-TLVs for link attributes.

Answer

Type 5 LSA

Answer

Type 11 LSA

Answer

Type 9 LSA

Question 3

A service provider wants to use BGP Prefix Independent Convergence (PIC) for faster failover. Which BGP feature must be enabled to support PIC?

Accepted Answer

BGP additional paths. BGP PIC requires BGP additional paths (add-path) or BGP PIC edge, which installs backup paths in the FIB independent of the prefix count.

Answer

BGP multipath

Answer

BGP route reflectors

Answer

BGP fast external fallover

Question 4

In BGP confederation, which attribute is used to prevent loops between sub-ASes?

Accepted Answer

Confederation AS_PATH. The confederation AS_PATH (AS_CONFED_SEQUENCE and AS_CONFED_SET) is used to track the path within the confederation, and loop detection checks this attribute.

Answer

CLUSTER_LIST

Answer

AS_PATH

Answer

ORIGINATOR_ID

Question 5

Which three BGP attributes are considered before the MED in the BGP best path selection process?

Accepted Answer

Weight. Weight, local preference, and AS_PATH length are considered before MED. ORIGIN is also before MED but AS_PATH is longer.

Answer

Next-hop metric

Answer

Multi-Exit Discriminator (MED)

Question 6

An SP engineer configures IS-IS fast convergence mechanisms. Which three techniques help achieve sub-second convergence in IS-IS?

Accepted Answer

Incremental SPF (iSPF). BFD provides fast failure detection, PRC recalculates only affected routes, and SPF incremental (iSPF) reduces SPF computation. LFA provides fast reroute.

Answer

Full SPF recalculation

Answer

LDP label distribution

Question 7

Which IS-IS level is used for routing within an area?

Accepted Answer

Level 1. IS-IS uses Level 1 (L1) for intra-area routing and Level 2 (L2) for inter-area routing.

Answer

Level 2

Answer

Level 0

Answer

Level 1/2

Question 8

In OSPF, which type of area does not allow external routes and only accepts a default route?

Accepted Answer

Stub area. A stub area blocks Type 5 LSAs and injects a default route; it does not accept external routes from other areas.

Answer

Backbone area

Answer

NSSA

Answer

Totally stubby

Question 9

In BGP route selection, which attribute is considered before LOCAL_PREF?

Accepted Answer

Weight. BGP route selection starts with the highest weight (Cisco proprietary), then highest LOCAL_PREF, then locally originated routes.

Answer

AS_PATH length

Answer

MED

Answer

LOCAL_PREF

Question 10

In IS-IS, which TLV is used to carry traffic engineering information for MPLS-TE?

Accepted Answer

TLV 22. In IS-IS, TLV 22 (Extended IS Reachability) is used to carry traffic engineering information, such as link attributes (bandwidth, admin group, TE metric), for MPLS-TE. TLV 135 (Extended IP Reachability) carries IP prefix information, not TE link attributes.

Answer

TLV 135

Answer

TLV 229

Answer

TLV 128

Question 11

A service provider wants to provide IPv6 connectivity over an existing MPLS IPv4 core using BGP extensions. Which technology should be used?

Accepted Answer

6PE. 6PE (IPv6 Provider Edge) uses BGP to carry IPv6 prefixes with an IPv4 next-hop over an MPLS core, avoiding the need for IPv6 in the core.

Answer

NAT64

Answer

Dual-stack

Answer

6VPE

Question 12

Which IS-IS metric type supports values up to 2^24-1 and is used for traffic engineering?

Accepted Answer

Wide metrics. IS-IS wide metrics use a 24-bit field, allowing values up to 16,777,215, and are required for TE.

Answer

Extended metrics

Answer

Narrow metrics

Answer

TE metrics

Question 13

Which BGP mechanism can reduce the number of iBGP sessions in a large SP network while preventing routing loops?

Accepted Answer

BGP route reflector. Route reflectors allow iBGP speakers to advertise routes learned from other iBGP peers, reducing full mesh requirements, and use cluster-id and originator-id to prevent loops.

Answer

BGP PIC

Answer

BGP confederation

Answer

BGP BFD

Question 14

In OSPFv3, which of the following is true about the protocol's operation?

Accepted Answer

It runs per-link rather than per-subnet. OSPFv3 runs per-link, not per-subnet; it uses link-local addresses for adjacencies and floods LSA types specific to IPv6.

Answer

It requires IPv4 to function

Answer

It uses the same LSA types as OSPFv2

Answer

It does not support authentication

Question 15

A service provider is implementing Segment Routing in an IS-IS network. Which TLV is used to advertise the Segment Routing Global Block (SRGB)?

Accepted Answer

TLV 242. The IS-IS Router Capability TLV (242) carries sub-TLVs including the SR Capabilities sub-TLV that advertises the SRGB.

Answer

TLV 22

Answer

TLV 229

Answer

TLV 135