Juniper Juniper Certifications JN0-347 Questions & Answers

• Question 61:

  An EX Series switch receives a frame with an unknown destination MAC address. What is the expected behavior?

  A. The frame is sent out all ports assigned to all configured VLANs except the ingress port on which the frame was received.

  B. The frame is sent out all access ports associated with the ingress VLAN regardless of whether a matching MAC address was found in the bridge table.

  C. The frame is sent out all ports assigned to the associated VLAN except the ingress port on which the frame was received.

  D. The frame is sent out all trunk ports associated with the ingress VLAN regardless of whether a matching MAC address was found in the bridge table.

  Correct Answer: C

• Question 62:

  Which two statements are correct about aggregate routes in the Junos OS? (Choose two.)

  A. An active route can contribute only to a single aggregate route.

  B. Only one aggregate route can be configured for each destination prefix.

  C. An aggregate route has a default next hop of an IP address.

  D. An aggregate route always shows as active in the routing table.

  Correct Answer: AB

  A route can contribute only to a single aggregate route. You can configure only one aggregate route for each destination prefix.

• Question 63:

  Which two sequence correctly describe the correct processing order of firewall filters on an EX Series switch? (Choose two.)

  A. port filter > VLAN filter > router filter > transmit packet

  B. router filter > VLAN filter > port filter > transmit packet

  C. receive packet > port filter > VLAN filter >router filter

  D. receive packet > router filter > VLAN filter > port filter

  Correct Answer: BC

  The order in which filters are applied depends on the direction in which they are applied, as indicated here:

  B: Egress filters (outbound traffic leaving the device or interface): C: Ingress filters (inbound traffic to the device or interface):

• Question 64:

  Click the Exhibit button.

  

  Referring to the exhibit, which statement is correct?

  A. 10.20.20.1 will be the active next hop.

  B. 10.30.30.1 will be the active next hop.

  C. Packets will be load balanced.

  D. Next hops 10.20.20.1 and 10.30.30.1 will both be active.

  Correct Answer: A

• Question 65:

  Click the Exhibit button.

  

  Referring to the exhibit, when using the default routing behavior, what happens to Packet A and Packet B on R1?

  A. Packet A is rejected and Packet B is forwarded to its destination.

  B. Packet A is forwarded to its destination and Packet B is rejected.

  C. Packet A and Packet B are forwarded to their respective destinations.

  D. Packet A and Packet B are discarded.

  Correct Answer: B

• Question 66:

  You are asked to ensure that a designated interface on an EX Series switch only allows a specific server to pass traffic. Which two features are required to satisfy this solution? (Choose two.)

  A. IP source guard

  B. proxy ARP

  C. MAC limiting

  D. persistent MAC learning

  Correct Answer: CD

• Question 67:

  Which static route next-hop value indicated that the packet will be silently dropped?

  A. resolve

  B. discard

  C. reject

  D. next-table

  Correct Answer: B

  If the static route has a discard next hop it means that if a packet does not match a more specific route, the packet is rejected and a reject route for this destination is installed in the routing table, but Internet Control Message Protocol (ICMP) unreachable messages are not sent.

• Question 68:

  What are three RSTP port states? (Choose three.)

  A. learning

  B. forwarding

  C. listening

  D. blocking

  E. discarding

  Correct Answer: ABE

  Port States in STP and RSTP

  

• Question 69:

  Click the Exhibit button.

  

  Referring to the exhibit, a packet tagged with vlan-id 34 arrives on interface xe-0/2/3.0 with a source MAC

  that does not match an entry in the DHCP snooping database.

  In this scenario, which statement is correct?

  A. The source MAC is added to the DHCP snooping database.

  B. An error message is logged and the packet is forwarded.

  C. The destination MAC added to the DHCP snooping database.

  D. The packet is forwarded and no error message is logged.

  Correct Answer: A

• Question 70:

  What are two interarea OSPF LSA types? (Choose two.)

  A. Type-4 ASBR summary LSAs

  B. Type 3 summary LSAs

  C. Type 1 router LSAs

  D. Type 2 network LSAs

  Correct Answer: AB

  A: The fourth LSA type, network example:

  

  In this example we have R1 that is redistributing information from the RIP router into OSPF. This makes R1 an ASBR (Autonomous System Border Router). What happens is that R1 will flip a bit in the router LSA to identify itself as an ASBR. When R2 who is an ABR receives this router LSA it will create a type 4 summary ASBR LSA and flood it into area 0. This LSA will also be flooded in all other areas and is required so all OSPF routers know where to find the ASBR.

  B: Example:

  

  Router 2 can create a Type 3 summary LSA and flood it into area 0. This LSA will flood into all the other areas of our OSPF network. This way all the routers in other areas will know about the prefixes from other areas. Note: The name "summary" LSA is very misleading. By default, OSPF is not going to summarize anything for you. There is however a command that let you summarize inter-area routes. Take a look at my OSPF summarization tutorial if you are interested. If you are looking at the routing table of an OSPF router and see some O IA entries, you are looking at LSA type 3 summary LSAs. Those are your inter-area prefixes!