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Free JN0-351 Exam Braindumps (page: 7)

Page 6 of 17
PDF with 107 Questions

You deployed a new EX Series switch with DHCP snooping enabled and you do not see any entries in the snooping databases for an interface.
Which two Juniper configurations for that interface caused this issue? (Choose two.)

  1. The interface is configured as a disabled port.
  2. MAC limiting is enabled on the interface.
  3. The interface is configured as a trunk port.
  4. Dynamic ARP inspection is enabled on the interface.

Answer(s): A,C

Explanation:

A is correct because the interface is configured as a disabled port. A disabled port does not forward any traffic, including DHCP packets. Therefore, DHCP snooping cannot learn any MAC addresses or lease information from a disabled port1.
C is correct because the interface is configured as a trunk port. By default, all trunk ports on the switch are trusted for DHCP snooping2. This means that DHCP snooping does not inspect or filter any DHCP packets received on a trunk port. Therefore, DHCP snooping does not add any entries to the snooping database for a trunk port2.



Exhibit



Your ISP is announcing a default route to both R1 and R2. You want your network routers to forward all Internet traffic through the R1 device
Which BGP attribute would you use?

  1. MED
  2. next-hop
  3. local preference
  4. origin

Answer(s): C

Explanation:

The BGP attribute that you would use to forward all Internet traffic through the R1 device is the local preference1.
The local preference is an attribute that is used within an autonomous system (AS) and exchanged between iBGP routers1. It is used to select an exit point from the AS1. The path with the highest local preference is preferred1. By setting a higher local preference for the routes received from R1, you can make R1 the preferred exit point for all Internet traffic1.



What are two characteristics of RSTP alternate ports? (Choose two.)

  1. RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch.
  2. RSTP alternate ports provide an alternate lower cost path to the root bridge.
  3. RSTP alternate ports provide an alternate higher cost path to the root bridge.
  4. RSTP alternate ports are active ports used to forward frames toward the root bridge.

Answer(s): A,C

Explanation:

A is correct because RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch. An alternate port is a backup port for a root port, which means it receives better BPDUs from another bridge than the current root port1. However, an alternate port does not forward any traffic, as it is in a discarding state2. It only listens to BPDUs and waits for the root port to fail. If the root port fails, the alternate port can immediately transition to a forwarding state and become the new root port1.
C is correct because RSTP alternate ports provide an alternate higher cost path to the root bridge. An alternate port is selected based on the same criteria as the root port, which are the lowest bridge ID, the lowest path cost, the lowest sender port ID, and the lowest receiver port ID3. However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself1. Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.



Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)

  1. AS path
  2. MED
  3. next hop
  4. community

Answer(s): A,C

Explanation:

BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention1. There are four categories of BGP attributes123:
Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers123.
Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates1.
Optional transitive: May not be supported by all implementations of BGP1. Optional non-transitive: May not be supported by all implementations of BGP1. The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update123. These include the AS path and next hop attributes23. Therefore, options A and C are correct.






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