Question 1 An IPv4 packet of total size of 2400 bytes is sent on path A - B - C,

Question

Question 1

   An IPv4 packet of total size of 2400 bytes is sent on path A - B - C, from A to C, with 2 links before the destination C. The MTU on link A-B is 1000 bytes and the MTU on link B-C is 500 bytes. How many fragments are received by node C, assuming no packet drops?

   a. 5

   b. 3

   c. 6

   d. 4

Question 2

   What support for multimedia applications with real-time delivery constraints does IPv6 have ?

   a. uses type-of-service (TOS) bits, like in IPv4

   b. uses the Differentiated Services header field like in IPv4

   c. defines the flow label header field to handle packets differently, depending on traffic type

   d. uses virtual circuit switching with resource allocation per circuit

Question 3

   A network runs the distance vector routing algorithm. Nodes are numbered from 0 to 5. At some time node 0's distance vector is [0, 2, infinity, 3,6, 9]. Right then node 0 receives from node 1 the distance vector [2, 0, 3, 2, 5, 5]. What is node 0's new distance vector after the update ?

   a. [0, 2, infinity, 3, 6, 6]

   b. [0, 2, 5, 4, 7, 7]

   c. [0, 2, 5, 3, 6, 7]

   d. [0, 2, 3, 3, 6, 9]

Question 4

   How does OSPF limit the overhead from flooding LSPs in a large network (i.e. with many routers)?

   a. a router decrements the TTL field in the OSPF packet header and drops the packet when TTL reaches 0

   b. the network is divided in areas and flooding is limited within the scope of each area. The backbone area forwards LSPs from each area to all other areas.

   c. the network is divided in areas and flooding is limited to an area. A border router aggregates LSPs from its area and sends them packed to all other border routers from the other areas.

   d. the network is divided in autonomous systems, with routing implemented hierarchically at local level (within as AS), then between autonomous systems.

Explanation / Answer

Q1
a. 5

Q2
a. uses type-of-service (TOS) bits, like in IPv4

Q3
d. [0, 2, 3, 3, 6, 9]

Q4.
c. the network is divided in areas and flooding is limited to an area. A border router aggregates LSPs from its area and sends them packed to all other border routers from the other areas.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.