EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
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Question
Chapter 8, Problem P22P
a)
Program Plan Intro
Given Statement:
“The router R1 will encrypt the datagram using IPsec when a host in 172.16.1/24 sends a datagram to an Amazon.com server.”
b)
Program Plan Intro
Given Statement:
“The router R1 will change the source and destination address of the IP datagram when a host in 172.16.1/24 sends a datagram to a host in 172.16.2/24.”
c)
Program Plan Intro
Given Statement:
“A host in 172.16.1/24 initiates a TCP connection to a Web server in “172.16.2/24”. Then all datagram’s sent by R1 will have protocol number 50 in the left-most IPv4 header field.”
d)
Program Plan Intro
Given Statement:
“A TCP segment is sent from a host in “172.16.1/24” to a host in “172.16.2/24”. R1 will not resend the TCP segment if this segment gets lost”.
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Students have asked these similar questions
a. Suppose we send into the Internet two IP datagrams, each carrying a different UDP
segment. The first datagram has source IP address A1, destination IP address B, source
port P1, and destination port T. The second datagram has source IP address A2,
destination IP address B, source port P2, and destination port T. Suppose that A1 is
different from A2 and that P1 is different from P2. Assuming that both datagrams reach
their final destination, will the two UDP datagrams be received by the same socket? Why
or why not?
b. Suppose Alice, Bob, and Claire want to have an audio conference call using SIP and
RTP. For Alice to send and receive RTP packets to and from Bob and Claire, is only one
UDP socket sufficient (in addition to the socket needed for the SIP messages)? If yes,
then how does Alice's SIP client distinguish between the RTP packets received from Bob
and Claire?
Host A sends a UDP datagram containing 8880
bytes of user data to host B over an Ethernet
LAN. Ethernet frames may carry data up to 1500
bytes (i.e. MTU = 1500 bytes). Size of UDP
header is 8 bytes and size of IP header is 20
bytes. There is no option field in IP header. How
many total number of IP fragments will be
transmitted and what will be the contents of
offset field in the last fragment?
An inbound IPv4 packet is received by a router with the routeing table shown in Figure 8-8. 10.55.72.234 is the originating IP address. 10.4.6.7 is the destination host. The TTL is set to one. The Protocol field has the value 6. What is the router's intended use for this packet?
Chapter 8 Solutions
EBK COMPUTER NETWORKING
Ch. 8 - Prob. R1RQCh. 8 - Prob. R2RQCh. 8 - Prob. R3RQCh. 8 - Prob. R4RQCh. 8 - Prob. R5RQCh. 8 - Prob. R6RQCh. 8 - Prob. R7RQCh. 8 - Prob. R8RQCh. 8 - Prob. R9RQCh. 8 - Prob. R10RQ
Ch. 8 - Prob. R11RQCh. 8 - Prob. R12RQCh. 8 - Prob. R13RQCh. 8 - Prob. R14RQCh. 8 - Prob. R15RQCh. 8 - Prob. R16RQCh. 8 - Prob. R17RQCh. 8 - Prob. R18RQCh. 8 - Prob. R19RQCh. 8 - Prob. R20RQCh. 8 - Prob. R21RQCh. 8 - Prob. R22RQCh. 8 - Prob. R23RQCh. 8 - Prob. R24RQCh. 8 - Prob. R25RQCh. 8 - Prob. R26RQCh. 8 - Prob. R27RQCh. 8 - Prob. R28RQCh. 8 - Prob. R29RQCh. 8 - Prob. R30RQCh. 8 - Prob. R31RQCh. 8 - Prob. R32RQCh. 8 - Prob. R33RQCh. 8 - Prob. P1PCh. 8 - Prob. P2PCh. 8 - Prob. P3PCh. 8 - Prob. P4PCh. 8 - Prob. P5PCh. 8 - Prob. P6PCh. 8 - Prob. P8PCh. 8 - Prob. P12PCh. 8 - Prob. P13PCh. 8 - Prob. P14PCh. 8 - Prob. P18PCh. 8 - Prob. P20PCh. 8 - Prob. P21PCh. 8 - Prob. P22PCh. 8 - Prob. P23P
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Similar questions
- There are two hosts a and B, which are connected through router R1. The IP addresses and MAC addresses of a, B and R1 are shown in the figure. Write out the ARP request packet sent by a to B and the MAC address and IP address of the received ARP response packet. (including source address and destination address). 220.168.11.16 A 00-15-C5-C6-CB-11 220.168.11.1 R1 220.168.10.1 02-21-13-16-42-910-15-C5-C6-08-11 220.168.10.12 MACE 00-15-CS-CB-C4-95arrow_forwardB. Suppose within your Web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host, so a DNS lookup is necessary to obtain the IP address. Suppose that two DNS servers are visited before your host receives the IP address from DNS. The first DNS server visited is the local DNS cache, with an RTT delay of RTTO = 5 msecs. The second DNS server contacted has an RTT of 8 msecs. Initially, let's suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Suppose the RTT between the local host and the Web server containing the object is RTTHTTP=63 msecs. 1. Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object? 2. Suppose the HTML object references 4 very small objects on the same web server. Neglecting transmission times, how much time elapses from when the client…arrow_forwardHost A sends the information of size 3000 bytes to Host B using TCP protocol. As long as Host B receives each packet in size 1000 bytes, Host B must acknowledge Host A. We assume the header size in each packet is 40 bytes. How many packets does Host A send to Host B totally? Question 18 options: 3 4 2 5arrow_forward
- Suppose within your web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host, so a DNS lookup is necessary to obtain the IP address. Suppose that three DNS servers are visited before your host receives the IP address from DNS. The first DNS server visited is the local DNS cache, with an RTT delay of RTT = 4 msecs. The second and third DNS servers contacted have RTTs of 45 and 24 msecs, respectively. Initially, let's suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Suppose the RTT between the local host and the Web server containing the object is RTTHTTP = 9 msecs. Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object? (Do not forget the TCP handshake(s).) 82 msecs O 91 msecs O 46 msecs O 67 msecsarrow_forwardAssume that a Host A contacts a name server B to get a cached DNS response (i.e., B does not have to go to the root name server, TLD name server, or authoritative name server to get a response). Suppose that A and B can communicate using UDP or TCP. However, any packet sent from A to B or from B to A has an independent chance of being lost of 10%. Let the round trip time for a packet to go from A to B and back (or B to A and back) be RTT. Let A start at a time = 0s. When the time is 2RTT, which of TCP or UDP is the better option for A to get the DNS response from B? Better here means higher probability of correctly receiving the DNS responsearrow_forwardConsider the Figure below: Assume host 10.0.0.1 wants to send datagram from its port 3345 to IP address 128.119.40.186 with port number 80. Assume that router uses port number 5001. Show the Source and destination IP addresses and port numbers for each step by considering NAT in the figure.arrow_forward
- After establishing a connection with the local DNS server PC1 now knows the IP and MAC addresses of PC2. Suppose PC1 [IP Address: 192.168.2.1, MAC Address: 0010.1191.A946] is sending an ARP packet to PC2 [IP Address: 192.168.2.2, MAC Address: 0110.1290.AD23]. What will be written in the target MAC address before the packet reaches PC2 ?arrow_forward2. In the figure below, Host A has a UDP Echo client while Host B has a UDP Echo server. The UDP Echo Client at Host A sends a message of size 100 Bytes to the UDP Echo server at Host B, and Host B echoes the same message back to Host A. Please measure the round trip time it would take for Host A to receive back the message it sends to Host B. Hosts A and B are connected using a Router R1 and links L1 and L2. The links, L1 and L2, have link transmission rates of 1 Mbps and 1 Mbps respectively. Assume that the router has a queuing delay of 1 milliseconds and a processing delay of 0.05 milliseconds. Assume that propagation delay is 0. Please state your response in accuracy of 6 decimal points. i.e., your response should have up to 6 places after the decimal. R Host A (UDP Echo Client) Link L1 1 Mbps Router R1 Link L2 1 Mbps Host B (UDP Echo Server)arrow_forwardHost A sends the information of size 3000 bytes to Host B using TCP protocol. As long as Host B receives each packet in size 1000 bytes, Host B must acknowledge Host A. We assume the header size in each packet is 40 bytes, the starting sequence number used by Host A is 1000, and the window size of the sender side is 3000 bytes. What is the value of SND.NXT when the first packet is sent out, but not acknowledged? 1000 2000 3000 1999 If a host is monitored, and there are seven TCP packets captured: {S1, S2, S3, S4, S5, S6, E1}, where Si represents ith Send packet, and Ej represent jth Echo packet. E1 here acknowledges and echoes all the six Send packets cumulatively. Which of the follow matching can make more sense to represent the RTT of the connection chain? E1 matches with S1 E1 matches with S4 E1 matches with S5 E1 matches with S6arrow_forward
- In IPV4, consider sending a 4,000 byte datagram (20 bytes of IP header) into a link that has an MTU of 1,500 bytes. The datagram will be allocated to fragments, and the offset value of the third segment is 3, 370 3, 185 4, 185 4, 370arrow_forwardP27. Host A and B are communicating over a TCP connection, and Host B has already received from A all bytes up through byte 126. Suppose Host A then sends two segments to Host B back-to-back. The first and second segments contain 80 and 40 bytes of data, respectively. In the first segment, the sequence number is 127, the source port number is 302, and the destination port number is 80. Host B sends an acknowledgment whenever it receives a segment from Host A. In the second segment sent from Host A to B, what are the sequence number, source port number, and destination port number? If the first segment arrives before the second segment, in the acknowledgment of the first arriving segment, what is the acknowledgment number, the source port number, and the destination port number? If the second segment arrives before the first segment, in the acknowledgment of the first arriving segment, what is the acknowledgment number? Suppose the two segments sent by A arrive in order at B.…arrow_forwardAssume that there is a single router between Alice's host and Bob's host. The bandwidth of the first link, i.e., from Alice's host to the router, is R1 bits/sec. The second link, which connects the router to Bob, has a bandwidth of R2 bits/sec. A. What is the total end-to-end delay for a packet of K bits that is sent from Alice's host to Bob's host? Ignore queueing, nodal, and propagation delay. B. Give a formula for calculating the throughput of the connection between the two hosts.arrow_forward
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