400-007

400-007 practice questions, page 13 of 14, with answer review and explanations.

Question 61

Refer to the exhibit. As part of a redesign project, you must predict multicast behavior. What happens to the multicast traffic received on the shared tree (*, G), if it is received on the LHR interface indicated?

  1. It is switched due to a successful RPF check against the routing table.
  2. It is switched given that no RPF check is performed.
  3. It is dropped due to an unsuccessful RPF check against the multicast receiver.
  4. It is dropped due to an unsuccessful RPF check against the multicast source.

Question 62

Refer to the exhibit. This network is running legacy STP 802.1d. Assuming "hello_timer" is fixed to 2 seconds, which parameters can be modified to speed up convergence times after single link/node failure?

  1. Only the maximum_transmission_halt_delay and diameter parameters are configurable parameters in 802.1d to speed up STP convergence process.
  2. The max_age and forward delay parameters can be adjusted to speed up STP convergence process.
  3. The transit_delay=5 and bpdu_delay=20 are recommended values, considering hello_timer=2 and specified diameter.
  4. Only the transit_delay and bpdu_delay timers are configurable parameters in 802.1d to speed up STP convergence process.

Question 63

Company XYZ is running a redundant private WAN network using OSPF as the underlay protocol. The current design accommodates for redundancy in the network, but it is taking over 30 seconds for the network to reconverge upon failure. Which technique can be implemented in the design to detect such a failure in a subsecond?

  1. fate sharing
  2. OSPF LFA
  3. flex links
  4. STP
  5. BFD

Question 64

Which three elements help network designers to construct secure systems that protect information and resources (such as devices, communication, and data) from unauthorized access, modification, inspection, or destruction? (Choose three.)

  1. scalability
  2. availability
  3. serviceability
  4. integrity
  5. confidentiality
  6. reliability

Question 65

Which relationship between iBGP and the underlying physical topology is true?

  1. iBGP full mesh requires an underlying fully meshed network topology.
  2. iBGP full mesh requirement does not dictate any specific network topology.
  3. iBGP does not work on a ring network topology even with an underlying IGP.
  4. iBGP can work only on a ring network topology with a link-state protocol like OSPF or IS-IS.