Juniper Juniper Certifications JN0-361 Questions & Answers

• Question 201:

  Click the exhibit button.

  

  In the exhibit, which configuration is correct when setting up LDP for R1?

  A. set interfaces ge-0/0/0 unit 0 family mpls set protocols mpls interface ge-0/0/0.0

  B. set interfaces ge-0/0/0 unit 0 family mpls set protocols mpls interface ge-0/0/0.0 set protocols ldp interface ge-0/0/0.0

  C. set protocols mpls interface ge-0/0/0.0 set protocols ldp interface ge-0/0/0.0

  D. set interfaces ge-0/0/0 unit 0 family mpls set protocols ldp interface ge-0/0/0.0

  Correct Answer: B

  Example: In this example, you enable the MPLS family and create an LDP instance on all the transit interfaces.

  

  For Router R1, perform the following: set interfaces ge-0/0/0 unit 0 family mpls set protocols mpls ge-0/0/0 unit 0 set protocols ldp interface ge-0/0/0.0 unit 0

  References: http://www.juniper.net/documentation/en_US/junos12.1x46/topics/example/mpls-security-ldpsignaled-lsp-configuring.html

• Question 202:

  Which address is within the IPv6 link-local address scope?

  A. f80e::52c5:8d03:e8f6:57c0

  B. fc00::52c5:8d03:e8f6:57c0

  C. 2001::52c5:8d03:e8f6:57c0

  D. fe80:0:0:0:52c5:8d03:e8f6:57c0

  Correct Answer: D

  In the Internet Protocol Version 6 (IPv6), the address block fe80::/10 has been reserved for link-local

  unicast addressing. To conform to standard /64 addressing on subnets, the actual link local addresses are

  assigned with the prefix fe80::/64.

  The 54 bits after the most significant ten bits must be zero.

  References: https://en.wikipedia.org/wiki/Link-local_address#IPv6

• Question 203:

  Which two BGP attributes are optional? (Choose two.)

  A. origin

  B. MED

  C. cluster list

  D. AS path

  Correct Answer: BC

  The MUTLI_EXIT_DISC (MED) is an optional non-transitive attribute that provides a mechanism for the network administrator to convey to adjacent autonomous systems to optimal entry point in the local AS. Cluster List is Optional non-transitive BGP attribute.

  Incorrect Answers:

  A: The ORIGIN is a well known mandatory attribute.

  D: The AS_PATH is a well-known mandatory attribute.

  References: http://www.informit.com/articles/article.aspx?p=331613andseqNum=5

• Question 204:

  Click the Exhibit button.

  

  Which statement is true regarding the output shown in the exhibit?

  A. The configuration supports IPv6 multicast routes.

  B. The configuration supports IPv6 unicast routes.

  C. The configuration supports IPv4 unicast routes.

  D. The configuration supports IPv4 multicast routes.

  Correct Answer: B

  By default, OSPFv3 supports unicast IPv6 routes, but you can configure OSPFv3 to support multiple address families. To support an address family other than unicast IPv6, you configure a realm that allows

  OSPFv3 to advertise IPv4 unicast, IPv4 multicast, or IPv6 multicast routes.

  Example of a configuration which support both Ipv4 and Ipv6 prefixes:

  user@host# show protocols ospf3

  realm ipv4-unicast {

  area 0.0.0.0 {

  interface fe-0/1/0.0;

  }

  }

  area 0.0.0.0 {

  interface fe-0/1/0.0;

  }

  References: http://www.juniper.net/documentation/en_US/junos15.1/topics/topic-map/ospfv3-multipleaddress-families.html

• Question 205:

  Click the Exhibit button.

  

  Which two statements are correct according to the output shown in the exhibit? (Choose two.)

  A. The peering session can pass inet-vpn routes.

  B. The peering session is enabled for multihop support.

  C. The peering session uses an altered route preference.

  D. The peering session is enabled for multipath support.

  Correct Answer: AB

  A: From the exhibit we see:

  Address families configured: inet-unicast inet-vpn-unicast

  B: From the exhibit we find:

  Options:

• Question 206:

  What separates areas in IS-IS?

  A. links

  B. DIS

  C. pseudo nodes

  D. routers

  Correct Answer: D

  IS-IS differs from OSPF in the way that "areas" are defined and routed between. IS-IS routers are designated as being: Level 1 (intra-area); Level 2 (inter area); or Level 1-2 (both). Routing information is exchanged between Level 1 routers and other Level 1 routers of the same area, and Level 2 routers can only form relationships and exchange information with other Level 2 routers. Level 1-2 routers exchange information with both levels and are used to connect the inter area routers with the intra area routers.

  References: https://en.wikipedia.org/wiki/IS-IS

• Question 207:

  Click the Exhibit button.

  

  Referring to the exhibit, R1 and R2 are unable to form an IS-IS adjacency on interface ge-0/0/1.0. The ge0/0/1.0 interface has the appropriate address families enabled.

  Which two actions will resolve the problem and allow the adjacency to come up? (Choose two.)

  A. Change the R2 loopback interface address to 49.3154.1111.1111.1111.00.

  B. Enable Level 2 adjacencies on R1.

  C. Enable Level 1 adjacencies on R1.

  D. Change the R2 loopback interface address to 49.3154.2222.2222.2222.00.

  Correct Answer: BD

  B: We need to enable level 2 adjacencies on R1, as an L1 adjacency is formed only with routers in the same area.An L2 adjacency is formed with routers in the same area or a different area.

  D: IS-IS uses ISO network addresses. Each address identifies a point of connection to the network, such as a router interface, and is called a network service access point (NSAP). For example, the NET address 49.0001.1921.6800.1001.00 consists of the following parts:

  49--AFI 0001--Area ID 1921.6800.1001--System identifier 00--Selector

  Incorrect Answers:

  C: Level 1 adjacencies on R1 are already enabled.

  References: http://www.subnetzero.info/2013/08/23/is-is-levels-and-adjacencies/

• Question 208:

  Which statement is true about VSTP?

  A. Adding VLANs to VSTP consumes more CPU resources.

  B. It supports 4093 spanning-tree topologies.

  C. It is compatible with PVST+, but not with PVST.

  D. Different VLANs must use different spanning-tree topologies.

  Correct Answer: A

  If you use VLANs, we recommend that you enable MSTP unless your network requires the device compatibility provided by VSTP. Switches configured to run VSTP automatically assign each VLAN to one spanning-tree instance that runs RSTP. While this approach is useful to optimize network usage in small networks with a limited number of VLANs, a VSTP configuration in a network with several hundred VLANs can overload switch CPUs.

  References: http://www.juniper.net/techpubs/en_US/junos13.2/topics/concept/spanning-trees-ex-seriesvstp-understanding.html

• Question 209:

  Which statement about Rapid Spanning Tree Protocol (RSTP) is correct?

  A. If a device configured for RSTP receives STP BPDUs, it sends STP BPDUs.

  B. If a device configured for RSTP receives STP BPDUs, it forwards them as STP BPDUs.

  C. If a device configured for RSTP receives STP BPDUs, it continues to send RSTP BPDUs.

  D. If a device configured for RSTP receives STP BPDUs, it sends RSTP and STP BPDUs.

  Correct Answer: B

  Enhancements enable RSTP to achieve sub-second forwarding and network convergence. RSTP is backward-compatible with legacy STP. If legacy STP BPDU is detected on a link, then an RSTP-capable bridge will revert to legacy STP on that given port.

  References: https://www.juniper.net/techpubs/en_US/junos12.3/topics/concept/mx-series-rstp-port-statesroles.html

• Question 210:

  Which two LSA types would an ABR generate and send into a totally stubby area? (Choose two.)

  A. Type 2 LSA

  B. Type 4 LSA

  C. Type 5 LSA

  D. Type 3 LSA

  Correct Answer: AD

  A stub area that only allows routes internal to the area and restricts Type 3 LSAs from entering the stub area is often called a totally stubby area.

  Totally stubby areas can only contain type 1 and 2 LSAs, and a single type 3 LSA.

  References: https://www.juniper.net/techpubs/en_US/junos15.1/topics/concept/ospf-stub-areasoverview.html