Juniper Juniper Certifications JN0-361 Questions & Answers

• Question 161:

  Your network is using the Junos default MPLS settings.

  Which label operation is performed by penultimate router?

  A. pop

  B. push

  C. replace

  D. swap

  Correct Answer: A

  The pop operation removes a label from the beginning of the packet. Once the label is removed, the TTL is copied from the label into the IP packet header, and the underlying IP packet is forwarded as a native IP packet.

• Question 162:

  In your network, you have two LDP routers connected across four physical interfaces. You also have enabled LDP to separate on all four of those interfaces.

  What is the resulting outcome of your configuration between those two devices?

  A. One session is built across one neighbor relationship

  B. One session is built across four neighbor relationships

  C. Four sessions are built across one neighbor relationship

  D. Four sessions are built across four neighbor relationships

  Correct Answer: B

• Question 163:

  You are troubleshooting the status of an RSVP LSP and the output of the "show mpls interface" command is blank.

  Which statements describes the reason for the blank output?

  A. Authentication was not configured on the local interface

  B. "family mpls" was not configured on the logical interface

  C. No configuration was added to the [edit protocols mpls] hierarchy

  D. No configuration was added to the [edit protocol rsvp] hierarchy

  Correct Answer: C

  You must add the mpls configuration within the [edit protocols mpls] hierarchy. Example: Configure set protocols mpls interface ge-1/1/0.0 commit and-quit

• Question 164:

  An RSVP LSP in your network is not operational and you suspect that the "family mpls" statement was omitted from the device configuration.

  Which operational mode command will help you to verify your suspicions?

  A. show interface terse

  B. show mpls lsp

  C. show rsvp session

  D. show rsvp interface

  Correct Answer: A

  The "show interfaces terse" command will show you which families are configured.

• Question 165:

  Your customer needs to communicate between four remote sites using Ethernet and would like to maintain IP reachability between devices using a single /24 network. The customer will need to use ARP from one site to another.

  Which solution will meet these requirements?

  A. a Layer 2 VPN

  B. a Layer 2 circuit

  C. a virtual private LAN service (VPLS)

  D. a Layer 3 VPN as defined in RFC 4364

  Correct Answer: C

  Explanation: VPLS is an Ethernet-based point-to-multipoint L2VPN where all locations can be part of the same /24 network.

• Question 166:

  Which statement is true about the operation of a Layer 2 VPN?

  A. The service provider will use a routing protocol from the PE to CE

  B. A Layer 2 VPN transports packets based on Data Link Layer headers

  C. Layer 2 VPNs cannot transport Layer 3 protocol information

  D. VPN signaling will be performed by RSVP

  Correct Answer: B

  In a layer 2 VPN, the PE and CE do not exchange routing information, and therefore Layer 2 information is used to transport the traffic.

• Question 167:

  Customers complain that they cannot reach remote sites. You notice that your VPN routes are hidden on

  PE routers and you suspect that a labe-switched path (LSP) is down.

  Which command will confirm MPLS reachability to a remote PE?

  A. show route table mpls.0

  B. show route table inet.3

  C. show route protocol bgp terse

  D. show route protocol mpls

  Correct Answer: B

  MPLS is used for forwarding, so there must be a next hop in inet.3. This table stores the egress address of an MPLS label-switched path (LSP), the LSP name, and the outgoing interface name. This routing table is sued only when the local device is the ingress node to an LSP.

• Question 168:

  You have configured refresh reduction in your RSVP network but you suspect that some of the Junos devices are not correctly operating in that mode. Which operational mode command can be used to view the refresh messages sent and received?

  A. show rsvp interface

  B. show rsvp version

  C. show rsvp neighbor detail

  D. show rsvp session detail

  Correct Answer: C

• Question 169:

  Which two statements are correct about provider-provisioned Layer 3 VPNs? (Choose two.)

  A. PE routers maintain forwarding tables for each customer VPN

  B. PE routers offer a Layer 2 circuit to each CE device

  C. PE routers and CE routers participate in conventional IP routing

  D. PE routers exchange VPN traffic through their internal routing protocols

  Correct Answer: AC

  Each routing instance you created on the PE will create a separate table. PE routers and CE routers participate in conventional IP routing, each using a dynamic routing protocol or static routing.

• Question 170:

  Which two RSVP messages are used to establish a new LSP? (Choose two.)

  A. path

  B. pathconfirm

  C. Resv

  D. ResvConfirm

  Correct Answer: AC

  RSVP path messages are sent downstream from the ingress router to the egress router. RSVP Resv messages are then sent upstream from the egress router to the ingress router. The path messages contain information about resources needed, and the Resv messages reserve these resources.