Bissoy.com
Doctors Medicines MCQs Q&A

Host A(on TCP/IP v4 network A) sends an IP datagram D to host B (also on TCP/IP v4 network B) Assume that no error occurred during the transmission of D. When D reaches B, which of the following IP header field(s) may be different from that of the original datagram D? i) TTL    ii) Checksum     iii) Fragment Offset

Host A(on TCP/IP v4 network A) sends an IP datagram D to host B (also on TCP/IP v4 network B) Assume that no error occurred during the transmission of D. When D reaches B, which of the following IP header field(s) may be different from that of the original datagram D? i) TTL    ii) Checksum     iii) Fragment Offset Correct Answer (i), (ii) and (iii)

  • TTL will change after each hop so checksum will also change.
  • Since MTU of the router is different therefore datagram may be different and hence fragment offset is different for different packets.

Related Questions

When a router cannot route a datagram or host cannot deliver a datagram, the datagram is discarded and the router or the host sends a ____________ message back to the source host that initiated the datagram.
Which two of the following are true regarding the distance-vector and link-state routing protocols?
1. Link state sends its complete routing table out all active interfaces on periodic time intervals.
2. Distance vector sends its complete routing table out all active interfaces on periodic time intervals.
3. Link state sends updates containing the state of its own links to all routers in the internetwork.
4. Distance vector sends updates containing the state of its own links to all routers in the internetwork.
Five delegates P, Q, R, S and T are forwarding their files to one another. P sends his file to Q, S and T, T sends his files to R while P and R exchange their files with each other. Q sends his file to S who sends his files to T. If P has to forward his files to R, then in how many ways P can forward files to R?
A message consisting of 2400 bits is to be passed over the Internet. The message is passed to the transport layer which appends a 150-bit header, followed by the network layer which uses a 120-bit header. Network layer packets are transmitted via two networks, each of which uses a 26-bit header. The destination network only accepts up to 900 bits long. The number of bits, including headers delivered to the destination network, is
One of the header fields in an IP datagram is the Time to Live (TTL) field. Which of the following statements best explains the need for this field?
Vikash threw dice 25 times and noted the number appearing each time as shown below: 2, 3, 1, 2, 4, 5, 4, 3, 6, 2, 3, 1, 6, 3, 4, 6, 1, 3, 2, 6, 3, 5, 6, 3, 4 The tally table of the above data will be (A)  Digits of dice occurred Tally marks 1 ||| 2 |||| 3 |||| || 4 |||| 5 || 6 |||| (B)  Digits of dice occurred Tally marks 1 ||||  2 ||| 3 |||| | 4 |||  5 || 6 |||| (C)  Digits of dice occurred Tally marks 1 |||| | 2 || 3 |||| | 4 |||| 5 || 6 |||| (D)  Digits of dice occurred Tally marks 1 |||| | 2 |||| 3 |||| || 4 ||||  5 ||| 6 ||||
Karim threw dice 30 times and noted the number appearing each time as shown below: 1, 2, 1, 2, 4, 4, 4, 3, 3, 2, 1, 1, 6, 3, 4, 6, 1, 3, 2, 6, 3, 5, 6, 3, 4, 4, 5, 6, 3, 1 The tally table of the above data will be (A)  Digits of dice occurred Tally marks 1 |||| | 2 |||| 3 |||| || 4 ||||  5 ||| 6 |||| (B) Digits of dice occurred Tally marks 1 ||||  2 |||| 3 |||| || 4 |||| | 5 ||| 6 |||| (C) Digits of dice occurred Tally marks 1 ||||  2 |||| 3 |||| | 4 |||| | 5 |||| 6 |||| (D) Digits of dice occurred Tally marks 1 |||| | 2 |||| 3 |||| || 4 |||| | 5 || 6 ||||
Which one of the combinations of the following statements is true about antibody structure?
P. Limited proteolysis of rabbit IgG with the enzyme pepsin generates two antigen-binding regions (Fab) and an Fc fragment.
Q. Limited proteolysis of rabbit IgG with the enzyme papain generates a single bivalent antigen-binding region F(ab')2 and peptide fragments.
R. The Fc fragment of IgG can self-associate and crystallize into a lattice.
S. The F(ab')2 fragment of IgG is composed of both light and heavy chains.
Which of the following statements are true? (a) The fragmentation fields in the base header section of IPv4 have moved to the fragmentation extension header in IPv6. (b) The authentication extension header is new in IPv6. (c) The record route option is not implemented in IPv6.
Consider a computer network using the distance vector routing algorithm in its network layer. The partial topology of the network is as shown below. The objective is to find the shortest-cost path from the router R to routers P and Q. Assume that R does not initially know the shortest routes to P and Q. Assume that R has three neighbouring routers denoted as X, Y, and Z. During one iteration, R measures its distance to its neighbours X, Y, and Z as 3, 2, and 5, respectively. Router R gets routing vectors from its neighbours that indicate that the distance to router P from routers X, Y, and Z are 7, 6, and 5, respectively. The routing vector also indicates that the distance to router Q from routers X, Y, and Z are 4, 6, and 8, respectively. Which of the following statement(s) is/are correct with respect to the new routing table of R, after updation during this iteration ?