350-501 Practice Test 10 — 10 Questions

Question 1

In EVPN-VPWS, which identifier is used to uniquely identify an Ethernet Segment for multi-homing?

Accepted Answer

ESI. The Ethernet Segment Identifier (ESI) uniquely identifies an Ethernet segment that is multi-homed to two or more PEs.

Answer

Route Distinguisher

Answer

EVI

Answer

MAC address

Question 2

A provider is implementing EVPN for data center interconnect. They require multi-homing with all-active load balancing and fast convergence using BGP. Which EVPN feature enables this?

Accepted Answer

Ethernet Segment Identifier (ESI). EVPN uses Ethernet Segment Identifier (ESI) for multi-homing. All-active mode allows load balancing across multiple PE nodes, and BGP control plane provides fast convergence via route withdrawal.

Answer

MPLS Traffic Engineering

Answer

BGP Link-State

Answer

VPLS with BGP autodiscovery

Question 3

Which THREE of the following are standard per-hop behaviors (PHBs) in the DiffServ model? (Select three.)

Accepted Answer

Default (Best Effort). The DiffServ model defines EF (Expedited Forwarding), AF (Assured Forwarding), and Default (BE) PHBs. CS is Class Selector, but not a separate PHB; it is part of AF? Actually CS is a backward-compatible PHB. Standard ones are EF, AF, and Default.

Answer

LLQ

Answer

CS (Class Selector)

Question 4

An SP engineer is configuring hierarchical QoS on a PE router to enforce a per-subscriber bandwidth contract of 10 Mbps and prioritize voice within that contract. Which MQC configuration sequence is correct?

Accepted Answer

Define child class-map and policy-map with LLQ, then parent policy-map with shape and service-policy child, applied to interface.. Hierarchical QoS uses a parent policy for shaping and a child policy for classification and priority queuing. The child is applied to the parent's class-default.

Answer

Define parent policy-map with shape, then child policy-map with LLQ, apply child directly to interface.

Answer

Use policing in the parent policy to enforce 10 Mbps and child for LLQ.

Answer

Define one policy-map with both shape and LLQ in the same class.

Question 5

When using NETCONF to edit a running configuration on a Cisco IOS XR router, which sequence of operations is correct?

Accepted Answer

, on candidate, , . NETCONF uses to modify the config; retrieves; prevents concurrent edits.

Answer

on candidate, then to running

Answer

<edit-config> on running, no lock needed

Answer

Question 6

An SP is migrating its core network to Segment Routing (SR-MPLS). The network uses IS-IS as the IGP with SR extensions. Which three statements about SR-MPLS architecture are correct?

Accepted Answer

Adjacency SIDs are local to a router and indicate a specific link.. An Adjacency SID is a local label assigned to a specific IS-IS adjacency, representing a particular link between two routers. It is locally significant and used to steer traffic over that specific next-hop, not globally unique.

Answer

The OSPF protocol cannot be used for SR-MPLS because it does not support SR extensions.

Answer

The SRGB must be identical across all routers in the domain to ensure global uniqueness.

Question 7

Which NETCONF RPC is used to retrieve the complete running configuration from a network device?

Accepted Answer

get-config. get-config with running retrieves the running configuration. The RPC retrieves both configuration and state data.

Answer

edit-config

Answer

get

Answer

lock

Question 8

Which RESTCONF HTTP method is used to create a new data resource?

Accepted Answer

POST. RESTCONF uses POST to create a new data resource. PUT is used to replace or create, but POST is the standard for creation.

Answer

GET

Answer

PUT

Answer

DELETE

Question 9

An SP router is configured with CBWFQ. For a data class requiring 30% bandwidth guarantee, which command is correct in the policy-map?

Accepted Answer

bandwidth percent 30. The 'bandwidth percent' command allocates a percentage of the interface bandwidth to the class.

Answer

fair-queue

Answer

priority percent 30

Answer

bandwidth 30

Question 10

An SP uses SR-PCE for traffic engineering. Which protocol does the SR-PCE use to communicate path computation requests and responses with path computation clients (PCCs)?

Accepted Answer

PCEP. PCEP (Path Computation Element Protocol) is used between PCCs (e.g., routers) and a PCE (e.g., SR-PCE) for path computation requests and responses.

Answer

BGP-LS

Answer

NETCONF

Answer

RESTCONF