Nokia Border Gateway Protocol Fundamentals for Services v1.0
Question 1
Which BGP message type is used to verify connectivity during and after BGP session establishment?
- A. Hello
- B. Update
- C. Open
- D. Keep-Alive
Answer : D
Question 2
Which of the following statements about BGP is FALSE?
- A. BGP uses Hello messages to dynamically discover BGP peers.
- B. To establish a BGP session, a TCP session must first be established between the two routers.
- C. BGP uses the OPEN message to exchange capability parameters between routers.
- D. BGP was originally designed as an exterior routing protocol.
Answer : D
Question 3
A TCP connection fails to be established with a BGP peer. Which of the following are valid options for the BGP connection state?
- A. Idle or Connect
- B. Idle or Active
- C. Connect or Active
- D. Connect or Open Sent
Answer : C
Question 4
A BGP session is stuck in the "Connect" state. Which of the following is the most likely reason?
- A. The remote BGP peer is properly configured but the local router is not.
- B. The local router is properly configured but the remote BGP peer is not.
- C. The BGP protocol is administratively disabled on the local router.
- D. The BGP protocol is administratively disabled on the remote BGP peer.
Answer : B
Question 5
Which of the following statements about BGP is FALSE?
- A. Peers need to be IP reachable to establish a BGP session.
- B. Route reflectors can reduce the number of iBGP sessions required.
- C. iBGP peers have to be adjacent to each other.
- D. The multihop parameter needs to be configured when eBGP peers are not adjacent to each other.
Answer : C
Question 6
What kind of BGP path attribute is AS_PATH?
- A. Optional transitive
- B. Optional non-transitive
- C. Well-known discretionary
- D. Well-known mandatory
Answer : D
Question 7
Which of the following statements about BGP peering sessions is FALSE?
- A. BGP peers need IP reachability between them.
- B. iBGP peers can be non-adjacent.
- C. eBGP peers have to be adjacent to each other.
- D. BGP peers can be configured with different AS numbers.
Answer : C
Question 8
A BGP router receives the following routes. Which route is selected as best route?
1) 192.169.20.0/24 with local preference 100, MED 150, AS Path 65300 65200 from an eBGP neighbor
2) 192.169.20.0/24 with local preference 100, MED 100, AS Path 63200 from an iBGP neighbor
3) 192.169.20.0/24 with local preference 200, MED 150, AS Path 65400 63200 from an iBGP neighbor
4) 192.169.20.0/24 with local preference 200, MED 100, AS Path 63700 from an eBGP neighbor
- A. Route 1
- B. Route 2
- C. Route 3
- D. Route 4
Answer : B
Question 9
Which of the following statements about the MED BGP path attribute is FALSE?
- A. The MED BGP path attribute is transitive.
- B. The MED BGP path attribute is optional.
- C. Routes having lower values in their MED BGP path attribute are preferred.
- D. The MED BGP path attribute's value is set by a router at the edge of an AS.
Answer : D
Question 10
An export policy is applied on a router to advertise a prefix to its eBGP peers. By default, which of the following updates are made to the route attributes?
- A. LOCAL_PREFERENCE is set to 100.
- B. NEXT_HOP is set to the neighbor router's interface IP address.
- C. The local AS number is added to AS_PATH.
- D. COMMUNITY is set to the local AS number.
Answer : C
Question 11
In the diagram, the BGP import policy "north-and-south" is applied to router R5. Router R1 advertises the prefix 140.100.1.0/24 with a community set to "65200:1". Which of the following statements about how router R5 processes the received route update for prefix 140.100.1.0/24 is TRUE?
- A. The prefix is rejected.
- B. The prefix's local preference is set to 20.
- C. The prefix's community value is removed.
- D. The prefix's community value is modified to 65200:2.
Answer : D
Question 12
On the Nokia 7750 SR, which of the following is NOT an address family that BGP supports?
- A. IPv4
- B. VPN-IPv4
- C. Label-IPv4
- D. MP-EVPN
Answer : C
Question 13
In the diagram below, a data packet is sent from CE1 to a far-end CE2 over a VPRN service across multiple regions. Which of the following statements about the tunnel labels is FALSE?
- A. The outer label is an RSVP, LDP, or segment routing label pushed by router Core1.
- B. The second label is a BGP label pushed by router RBR1.
- C. The service label is a label pushed by router PE1.
- D. The outer label will be popped by router Core2.
Answer : A
Question 14
In the diagram below, an end-to-end transport tunnel needs to be established between PE1 and PE2 using MP-BGP. Which of the following items is NOT required?
- A. MP-BGP address families label-ipv4 or label-ipv6 need to be supported on each of the edge routers.
- B. Either RSVP, LDP, or segment routing tunnels need to be established between regions.
- C. Either RSVP, LDP, or segment routing tunnels need to be established within each region.
- D. Each PE router needs to advertise an IP address as a labeled BGP route to identify the tunnel endpoint.
Answer : D
Question 15
Which of the following statements about IPv6 Link-Local addresses is FALSE?
- A. They are assigned to every physical interface running IPv6.
- B. They are only valid for communication within the same broadcast domain.
- C. They all have the same 64-bit subnet prefix.
- D. They have an interface ID derived by default from the interface’s IPv4 address.
Answer : D