Juniper Juniper Certifications JN0-361 Questions & Answers

• Question 131:

  By default, how often does a designated intermediate system (DIS) send IS-IS hello messages on a LAN?

  A. every 3 seconds

  B. every 9 seconds

  C. every 10 seconds

  D. every 30 seconds

  Correct Answer: A

  The default time period for most IS-IS hellos is every 9 seconds, however a DIS sends them every 3 seconds.

• Question 132:

  

  Referring to the network illustrated in the exhibit, how does R1 reach destinations in Area 49.2222?

  A. It uses the routes from Area 49.2222, which it learns from R2

  B. It sees the attached bit from R2 and creates a default route

  C. It must have a default route manually configured

  D. It receives a default route in the IS-IS update from R2

  Correct Answer: B

  When an IS-IS Level 1 router discovers that its neighbor has inter-area connectivity because the attached bit is set, it automatically creates a default route with that peer as the next hop.

• Question 133:

  -- Exhibit -

  user@router> show isis database IS-IS level 2 link-state database: LSP ID Sequence Checksum Lifetime Attributes Tokyo.00-00 0x6 0xb978 1154 L1 L2 host.00-00 0x4 0x140c 1154 L1 L2 Wash-DC.00-00 0x1d7 0x7f37 683 L1 L2 Beijing.00-00 0x1d3 0xe603 1024 L1 L2 Beijing.02-00 0x9 0xea81 1175 L1 L2 Amsterdam.00-00 0x1c8 0x8b1c 677 L1 L2 Cairo.00-00 0x1ca 0x1571 1103 L1 L2 Sydney.00-0 0x1dd 0x178a 779 L1 L2 8 LSPs

  The exhibit displays the output of the command "show isis database" on a Junos device. Why are there two entries for the Beijing device?

  A. There are two devices in the network with the host name Beijing; this problem should be repaired

  B. The Beijing device is routing both IPv4 and IPv6

  C. The Beijing device is a designated intermediate system (DIS)

  D. The Beijing device is going through a graceful restart

  Correct Answer: C

  All IS-IS routers enabled for a given level generate an LSP that is present in the LSDB. The pseudo portion is always 00. If a DIS exists, that device will advertise an additional LSP representing 'the network'. with a value other than 00, such as 01 or 02.

• Question 134:

  Which IS-IS adjacencies? (Choose two.)

  A. Level 1 adjacencies can form in the same (intra) area only.

  B. Level 2 adjacencies are formed between (inter) areas only.

  C. Level 2 adjacencies can be established either interarea or intra-area.

  D. Level 2 adjacencies can form within the same (intra) area only.

  Correct Answer: AC

• Question 135:

  Which packet type does a Junos device use to request up-to-date link-state information?

  A. IIH

  B. LSP

  C. PSNP

  D. CSNP

  Correct Answer: C

  With IS-IS, a partial sequence number PDU (PSNP) performs a similar function as a Link State Request packet does in OSPF, which is to request link-state data.

• Question 136:

  In an IS-IS network, which device represents the pseudonode?

  A. a designated intermediate system

  B. an area border router

  C. a router with an IS-IS export policy

  D. a router connected to the backbone

  Correct Answer: A

  On broadcast networks in the IS-IS protocol, the elected DIS creates the pseudo-node, which represents itself and advertises it into the network at the appropriate level.

• Question 137:

  Click the Exhibit button.

  

  In the exhibit, which configuration is required to establish a single adjacency between the two IS- IS routers?

  A. set protocols isis interface xe-0/0/0.0 point to point

  B. set protocols isis level 2 wide-metrics-only

  C. set protocols isis interface xe-0/0/0.0 level 1 disable

  D. set protocols isis interface xe-0/0/0.0 level 1 priority 0

  Correct Answer: A

• Question 138:

  What are three circumstances under which a router sends link-state PDUs (LSPs)? (Choose three)

  A. LSPs are sent periodically every 9 seconds

  B. LSPs are sent when there is a network change

  C. LSPs are sent during adjacency formation

  D. LSPs are sent in response to CSNP messages

  E. LSPs are sent in response to PSNP messages

  Correct Answer: BCE

  Link-state PDUs are sent as a response to a link-state request with a PSNP and during the formation of an IS-IS neighbor relationship. They are also sent as a triggered event when network changes occur.

• Question 139:

  Your OSPF network is currently operating with a single backbone area and you are concerned with the scalability of your design.

  Which network design is a best practice for providing the scalability you desire?

  A. Eliminate all designated routers

  B. Implement areas in your network

  C. Reduce the database refresh timer value

  D. Allow each device to perform ASBR duties

  Correct Answer: B

• Question 140:

  Which configuration parameter allows a Junos device to include an interface route into OSPF while prohibiting adjacencies from forming?

  A. inactive

  B. no-peer-advertise

  C. disable

  D. passive

  Correct Answer: D

  To include an interface route into OSPF as an internal OSPF route while prohibiting adjacency formation for that interface, you should include the interface under the [edit protocols ospf area area-number] hierarchy level along with the passive configuration option.