check my answers for Local Area Networking I came up with these answers, can ple
ID: 3739927 • Letter: C
Question
check my answers for Local Area Networking
I came up with these answers, can please check my answers
my answers in bold
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IV. Getting from Here to There
A. The next questions are based on the figure of the network below connecting AS1, AS2, AS3, AS4 and AS5. End host X connects to Ethernet switch B (e.g. in the wiring closet of a building which in turn connect to the routers inside AS1 (e.g. campus backbone routers), which in turn connects to the public Internet provider AS2 via BGP router B1.
B. If Ethernet switches A-F run the Spanning Tree Protocol (remember all links have the same cost), and A is the root of the spanning tree, which of the following statements are true?
Packets from X to Y will travel along the path BAD. BCD is not part of the spanning tree rooted at A, and so packets will flow via A.
Packets from AD will travel indefinitely around the loop ADEFA, unless the TTL expires.
If switch A fails, X will no longer be able to communicate with Y.
All of the links between the switches will be used to forward regular data packets.
A-F will learn link state information from routers R1R6 and optimize the spanning tree between the switches accordingly.
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C. AS1 uses OSPF to route packets internally using the link weights shown. BGP router B1 also takes part in the OSPF routing algorithm for AS1.
D. Assume the link from R4R3 fails, what is the shortest path now from R4 to B1?
R4-R5-R3-B1
R4-R2-R1-B1
R4-R6-R5-R3-B1
R4-R2-R1-R3-B1
R4-R5-R3-R1-B1
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E. If AS1 uses default routing, do routers R1-R6 contain separate routing entries for prefixes in AS4 and AS5?
Yes
No
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F. Can B7 aggregate prefixes for AS5 before advertising them to AS3 and AS2?
Yes
No
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G. Which of the following route advertisements does AS2 receive for prefixes in AS5?
19.15.0.0/16 AS3 AS4
19.15.0.0/16 AS4 AS5
19.15.0.0/16 AS3 AS4 AS5
19.16.0.0/16 AS5
19.16.0.0/16 AS4 AS5
19.16.0.0/16 AS3 AS4 AS5
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H. If AS5 uses the Routing Internet Protocol (RIP) to route packets between routers R7 – R11 and B8, how many steps will Bellman Ford algorithm need to run in order to be sure the algorithm will converge?
2
3
4
5
6
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I. Which of the following statements are true for the network as a whole?
Packets from X to Y are guaranteed to take the same path as packets from Y to X.
IP datagrams from X to Y will be transmitted with destination IP address of R4 and encapsulated in an Ethernet frame with destination Ethernet address of B.
IP datagrams from X to Y will be transmitted with destination IP address of Y and encapsulated in an Ethernet frame with destination Ethernet address of R4.
If an IP datagram with destination address 19.15.1.4 arrives to E, and is encapsulated in an Ethernet frame with destination address of R4, then the switches and routers will attempt to forward the packet via several hops to AS5.
B. BGP router R, Non-BGP router A Ethernet switch AS2 B, AS4 2 AS1 17.0.0.0/8 AS5 19.15.0.0/16 19.16.0.0/16 10Explanation / Answer
B.
A-F will learn link state information from routers R1R6 and optimize the spanning tree between the switches accordingly
because spanning tree protocol focuses in avoiding loops when redundant paths are available and switches are involved nodes can learn about the links and optimize the traveling path.
D.
B. R4-R2-R1-B1 (as this path cost 9 which is the smallest value possible)
E.
No, because there is R2 between R4 and R1 unlike R6, hence the prefix will be different even in default.
F.
Yes, because B7 is the 2nd last node, it will have all the prefixes of AS5.
G.
19.16.0.0/16 AS4 AS5
19.16.0.0/16 AS3 AS4 AS5
H
2
I.
IP datagrams from X to Y will be transmitted with destination IP address of R4 and encapsulated in an Ethernet frame with destination Ethernet address of B.
If an IP datagram with destination address 19.15.1.4 arrives to E, and is encapsulated in an Ethernet frame with destination address of R4, then the switches and routers will attempt to forward the packet via several hops to AS5.
Review ur answer only G except that all are correct
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