JNCIP-ENT Practice Test 5 — 25 Questions

Question 1

You are configuring OSPFv2 on a Junos device and need to inject default routes into an OSPF NSSA area. Which configuration command under protocols ospf area should be used?

Accepted Answer

set protocols ospf area 0.0.0.1 nssa default-metric 10. To inject a default route into an NSSA area in Junos OSPF, the stub default-metric command or nssa no-summarize with default-metric is configured under the specific area. Specifically, 'nssa default-metric' generates a Type 7 default LSA.

Answer

set protocols ospf area 0.0.0.1 stub default-metric 10

Answer

set protocols ospf area 0.0.0.1 nssa originate-default

Answer

set protocols ospf area 0.0.0.1 nssa default-route-advertise

Question 2

You need to adjust the OSPF cost on a specific interface to manipulate path selection. Which command sets the OSPF cost on an interface?

Accepted Answer

set protocols ospf area 0.0.0.0 interface xe-0/0/0.0 cost 50. OSPF interface cost is explicitly configured under the interface hierarchy within protocols ospf using the 'cost' statement.

Answer

set routing-options interface xe-0/0/0.0 ospf-cost 50

Answer

set interfaces xe-0/0/0.0 ospf-cost 50

Answer

set protocols ospf area 0.0.0.0 interface xe-0/0/0.0 metric 50

Question 3

Which THREE configuration tasks are required when implementing OSPFv3 on Junos devices? (Choose three)

Accepted Answer

Enabling OSPFv3 under the protocols ospf3 hierarchy. Configuring OSPFv3 requires specifying protocols ospf3, configuring areas, and enabling OSPFv3 on specific interfaces (IPv6 enabled).

Answer

Configuring BGP autonomous system numbers for OSPFv3 operation

Answer

Enabling IPv4 address families inside protocols ospf3

Question 4

An administrator implements LLDP-MED on an EX Series switch network. To prevent unauthorized devices from masquerading as IP phones and requesting voice VLAN access, which feature should be combined with LLDP-MED?

Accepted Answer

IEEE 802.1X port-based authentication with dynamic VLAN assignment. MAC Radius or 802.1X authentication combined with VLAN assignment and LLDP-MED ensures security before voice policies are trusted.

Answer

Storm control with broadcast filtering

Answer

DHCP snooping and Dynamic ARP Inspection (DAI)

Answer

IP Source Guard

Question 5

Which LLDP TLV (Type-Length-Value) is mandatory for LLDP-MED operation and is used to distinguish media endpoint devices from standard network switches and routers?

Accepted Answer

LLDP-MED Capabilities TLV. The Capabilities TLV allows devices to advertise whether they are standard bridge/router devices or LLDP-MED endpoints.

Answer

MAC Address TLV

Answer

Port ID TLV

Answer

System Description TLV

Question 6

Which THREE statements describe the behavior of LLDP-MED capability on Junos EX Series switches? (Choose three.)

Accepted Answer

It automates network policy configuration for voice, video, and guest VLANs.. LLDP-MED enables advanced capabilities like device location, inventory management, and network policies for endpoints.

Answer

It replaces the need for Ethernet switching entirely by converting access ports into routed links.

Answer

It requires OSPFv3 to be running on all connected IP phones.

Question 7

Which Junos configuration hierarchy is used to disable the generation of OSPF Type-7 to Type-5 LSA translation on an NSSA Area Border Router (ABR)?

Accepted Answer

set protocols ospf area nssa translator-role never. To prevent an NSSA ABR from translating Type-7 LSAs into Type-5 LSAs, you use the 'no-summaries' or 'nssa translator never' commands. Specifically, disabling translation is done via 'set protocols ospf area nssa translator-role never'.

Answer

set protocols ospf area <name> stub no-translate

Answer

set protocols ospf translate-type7 off

Answer

set protocols ospf area <name> nssa no-translation

Question 8

You notice that an EX4300 switch power budget calculation is set to use 'class-based' allocation. What does this mean regarding how power is reserved for connected IP phones?

Accepted Answer

The switch reserves power according to the maximum wattage defined by the device's hardware PoE class (e.g., Class 0, Class 3).. Class-based power allocation reserves the maximum wattage specified by the device's 802.3af/at power class, regardless of actual consumption.

Answer

The switch allocates a flat 15.4W to every port regardless of what device is plugged in.

Answer

The switch shares a dynamic pool where ports draw power on a first-come, first-served basis without limits.

Answer

The switch allocates power based on real-time LLDP-MED reported consumption values.

Question 9

In an enterprise network running PIM sparse-mode, an engineer notices that multicast traffic is switched from the shared tree (*,G) to the source-specific tree (S,G) prematurely, causing micro-bursts on core links. Which command disables this automatic switchover behavior on a Junos router?

Accepted Answer

set protocols pim spt-threshold infinity. By default, last-hop routers switch from (*,G) to (S,G) upon receiving the first packet from source S. To prevent this, the 'spt-threshold infinity' command is configured under [edit protocols pim].

Answer

set routing-options multicast spt-mode disable

Answer

set protocols pim disable-spt-switchover

Answer

set protocols igmp spt-threshold 0

Question 10

An administrator notices that an EX4300 switch is supplying power using LLDP-MED power negotiation, but the IP phone is drawing more power than the initial hardware class allows. Where would you check the advertised LLDP-MED TLV power value received from the phone?

Accepted Answer

show lldp neighbor interface ge-0/0/10 detail. The show lldp neighbor interface command displays detailed TLVs received from connected LLDP-MED endpoints, including power requirements.

Answer

show system lldp-med power-statistics

Answer

show poe interface ge-0/0/10 lldp-negotiation

Answer

show ethernet-switching interfaces lldp ge-0/0/10

Question 11

An administrator wants to configure a static Rendezvous Point (RP) with IP address 192.168.100.1 for all multicast groups on a Junos router. Which configuration accomplishes this?

Accepted Answer

set protocols pim rp static address 192.168.100.1. Static RPs are defined under protocols pim rp static address. Group ranges can also be specified.

Answer

set routing-options multicast rp 192.168.100.1

Answer

set protocols pim static-rp address 192.168.100.1

Answer

set protocols igmp rp address 192.168.100.1

Question 12

An enterprise has deployed MSDP between two independent PIM sparse-mode domains. An administrator notices that Source-Active (SA) messages are looping between MSDP peers. Which Junos mechanism should be configured to prevent SA message loops in an MSDP topology?

Accepted Answer

Configure an MSDP mesh group using 'set protocols msdp mesh-group <name>'.. MSDP uses a modified Reverse Path Forwarding (RPF) check for SA messages. To prevent loops in complex topologies, peer RPF flooding rules or MSDP mesh groups are configured using 'set protocols msdp mesh-group'.

Answer

Configure static RPF routes pointing to the peer loopbacks.

Answer

Enable PIM Dense-Mode on the interconnecting links between the MSDP peers.

Answer

Apply a TTL scoping boundary on the MSDP TCP sessions.

Question 13

Which command allows you to verify the real-time PoE power consumption, allocated wattage, and operational status of all interfaces on an EX Series switch?

Accepted Answer

show poe interface. The show poe interface operational command displays detailed power metrics per port.

Answer

show interfaces diagnostics poe

Answer

show chassis poe status

Answer

show lldp poe-status

Question 14

You are redistributing BGP routes into OSPF on an MX Series router. By default, what metric type and cost are assigned to these redistributed routes when they enter the OSPF domain?

Accepted Answer

Metric-type 2 with a cost of 1. By default, routes redistributed into OSPF are assigned metric-type 2 (E2) and a default metric value of 1.

Answer

Metric-type 1 with a cost of 20

Answer

Metric-type 1 with a cost of 0

Answer

Metric-type 2 with a cost of 10

Question 15

An enterprise engineer is configuring Multicast Source Discovery Protocol (MSDP) on a Junos device. Which THREE statements accurately describe MSDP behavior and functions? (Choose three)

Accepted Answer

MSDP uses Source-Active (SA) messages to advertise active multicast sources to peer RPs.. MSDP is used between RPs to share active sources, uses TCP for transport, and uses SA (Source-Active) messages.

Answer

MSDP replaces PIM sparse-mode for forwarding multicast data traffic to receivers.

Answer

MSDP runs directly over IP protocol number 46.

Question 16

Which THREE parameters are typically included in an LLDP-MED network policy TLV for voice application? (Choose three.)

Accepted Answer

VLAN ID. LLDP-MED network policies specify VLAN ID, Layer 2 priority (802.1p), and Layer 3 DSCP markings.

Answer

IP Phone MAC Address

Answer

Switch Power Supply Serial Number

Question 17

Which statement is true regarding the behavior of the supplicant mode 'single' on an EX Series switch port?

Accepted Answer

Only one supplicant is allowed on the port; if a second device connects, it is blocked or unauthenticated.. Single-supplicant mode allows only a single authenticated client on the port. If a hub or IP phone with a PC is connected, only one device passes authentication.

Answer

It allows up to 256 MAC addresses to authenticate simultaneously via MAC RADIUS.

Answer

Multiple supplicants are allowed, but they must all share the same VLAN and credentials.

Answer

It enables multi-domain authentication for voice and data devices.

Question 18

An administrator is configuring a Junos device to support IGMPv3 on user-facing VLAN interfaces. Which configuration statement enables IGMPv3 processing on interface irb.10?

Accepted Answer

set protocols igmp interface irb.10 version 3. IGMP version selection on Junos interfaces is configured under protocols igmp interface.

Answer

set protocols pim interface irb.10 igmp-version 3

Answer

set interfaces irb.10 family inet igmp-version v3

Answer

set routing-options multicast igmp-version 3

Question 19

Which command displays the global status, TLV counters, and operational state of LLDP on an EX Series switch?

Accepted Answer

show lldp. show lldp provides system-wide operational data for LLDP.

Answer

show protocols lldp summary

Answer

show system lldp status

Answer

show ethernet-switching lldp

Question 20

An administrator wants to verify LLDP and LLDP-MED operation on an EX Series switch. Which THREE operational commands provide relevant diagnostic information? (Choose three.)

Accepted Answer

show poe interface. Operational verification of LLDP utilizes show lldp neighbor, show lldp med neighbors, and show poe interface commands.

Answer

show spanning-tree interface

Answer

show chassis routing-engine