JNCIP-ENT Practice Test 2 — 10 Questions

Question 1

When configuring a BGP route reflector cluster in Junos, which THREE guidelines or operational behaviors should an engineer keep in mind? (Choose THREE)

Accepted Answer

A route reflector must never reflect routes received from a non-client peer back to other non-client peers.. Route reflectors reflect routes between clients and non-clients. Loop prevention uses Originator ID and Cluster List. Redundant RRs in the same cluster must share the same cluster ID to prevent routing loops and oscillation.

Answer

Clients of a route reflector must be configured in a full iBGP mesh with each other.

Answer

Route reflectors automatically modify the AS_PATH attribute of all reflected routes.

Question 2

A network engineer has configured BGP multipath on a Junos routing device using the 'multipath' statement under the routing-options bgp hierarchy. However, traffic is still only utilizing a single path. Which condition must be met for BGP multipath to become active for a destination prefix?

Accepted Answer

All competing BGP paths must have identical AS path lengths, local preference, origin, and MED.. For BGP multipath to be valid in Junos, the paths must have matching AS path lengths, local preferences, origins, and MEDs, along with valid next-hop resolution through the IGP.

Answer

Multipath requires BGP prefix-independent convergence (PIC) to be explicitly enabled on all routing engines.

Answer

The next hops must be directly connected interfaces without relying on IGP resolution.

Answer

All paths must originate from the exact same autonomous system in the AS path attribute.

Question 3

You are configuring Q-in-Q tunneling on an MX Series router where customer frames arrive with VLAN tag 100, and you need to encapsulate them with a service provider outer VLAN tag 3000 using 'vlan-map'. Where is the VLAN map applied?

Accepted Answer

Under the logical interface unit configuration using input/output vlan-map. VLAN maps or rewriting rules are applied on the logical interface (subinterface) inbound or outbound directions.

Answer

Under the routing-instance bridge-domain configuration

Answer

Under protocols l22-control configuration hierarchy

Answer

Under the physical interface encapsulation statement

Question 4

When applying a rewrite rule on an interface, you notice that packets are being remarked incorrectly. You realize that both a DSCP rewrite rule and an IEEE 802.1p rewrite rule are configured on the same physical interface. What is the rule regarding multiple rewrite rules on a single interface in Junos?

Accepted Answer

Different rewrite rule types (such as DSCP and ieee-802.1) can be applied simultaneously on the same logical interface. Junos allows only one rewrite rule per packet header type (e.g., one DSCP, one 802.1p) per logical interface, but you can have different header types applied simultaneously if they map to different packet layers.

Answer

Applying multiple rewrite rules causes an automatic system kernel crash

Answer

Only one rewrite rule total can be applied per logical interface regardless of type

Answer

Only Layer 2 rewrite rules are permitted on trunk ports

Question 5

A network designer needs to implement BGP route reflection where multiple route reflectors are deployed in the same cluster to provide redundancy. What parameter must be identical across all route reflectors in that same cluster to prevent routing loops?

Accepted Answer

Cluster ID. Route reflectors within the same cluster must share the same Cluster ID so they can recognize and ignore routes reflected by their peer route reflector.

Answer

AS Path Prepend count

Answer

Local Preference value

Answer

Router ID

Question 6

An administrator wants to configure MSDP (Multicast Source Discovery Protocol) between two autonomous system border routers to share active source information. Which configuration hierarchy in Junos is used to define the MSDP peer relationship?

Accepted Answer

[edit protocols msdp]. MSDP in Junos is configured under the [edit protocols msdp] hierarchy.

Answer

[edit routing-options msdp]

Answer

[edit protocols pim msdp]

Answer

[edit protocols bgp group msdp]

Question 7

You have configured a custom scheduler map, but traffic in the best-effort queue is being starved during periods of heavy congestion. Which scheduler parameter should you adjust to guarantee a minimum bandwidth for this queue?

Accepted Answer

transmit-rate. The transmit-rate parameter in a scheduler definition guarantees a minimum bandwidth allocation for a queue even during congestion.

Answer

drop-profile-map

Answer

buffer-size temporal

Answer

priority high

Question 8

You are troubleshooting a scenario where multi-field classifiers and behavior aggregate classifiers are both configured on the same ingress interface. In what order does Junos process classification?

Accepted Answer

Behavior aggregate classification is evaluated first, and multi-field classification can override the result. Junos processes Behavior Aggregate (BA) classification first, followed by Multi-Field (MF) classification which can override the BA result.

Answer

Junos rejects configurations where both BA and MF classifiers are applied to the same interface

Answer

Both classifiers are executed simultaneously in hardware without precedence

Answer

Multi-field classification is evaluated first, followed by behavior aggregate classification

Question 9

An IP phone connected to an EX4600 switch fails to power up. You run show poe interface ge-0/0/1 and find the status displays 'Hardware error'. What is the most appropriate troubleshooting step?

Accepted Answer

Check the switch's power supply units (PSUs) and internal PoE controller status using show chassis power.. The 'Hardware error' status in 'show poe interface' indicates a physical or internal hardware fault with the PoE controller or power supply, not a configuration issue. Checking the switch's PSUs and PoE controller status with 'show chassis power' is the appropriate first step to diagnose power delivery problems. This command displays power supply status, capacity, and any failures.

Answer

Reconfigure the port from access mode to trunk mode.

Answer

Modify the LLDP-MED network policy timeout value to allow longer initialization.

Answer

Disable spanning tree protocol on the interface.

Question 10

Which statement accurately describes the function of the 'server-timeout' setting within a Juniper access profile?

Accepted Answer

It defines how long the switch waits for a reply from the RADIUS server before failing over to the next server.. The server-timeout setting determines how long the switch waits for a response from a RADIUS server before trying the next server in the server group.

Answer

It determines the maximum duration a client session can remain active before forced re-authentication.

Answer

It dictates the interval at which the switch sends RADIUS accounting interim updates.

Answer

It specifies the idle timeout period for disconnected supplicants.