Question

ND-OF-CHAPTER QUESTIONS Thought Questions 1. How do you think TCP would handle the problem if an acknowledgment were lost, so that the sender retrans- mitted the unacknowledged TCP seg- ment, therefore causing the receiving transport process to receive the same segment twice? 2-2. a) Compute the minimum number of TCP segments required to open a con- nection, send an HTTP request and response message, and close the con- nection. Justify this number by creating a table showing each message and its sequence number. b) Repeat the ques- tion, this time if the HTTP response mes- sage is damaged during transmission. 2-3. Compute the minimum number of TCP segments required to open a con- nection, send an HTTP request and response message, and close the con- nection if the HTTP response message must be fragmented across ten packets. Justify this number by creating a table showing each message and its sequence number a) In Figure 2-16, what will be the value in the destination port number field if 2-4. ternet Research: April 1 RFCS a packet arrives for the e-mail applica- tion? b) When the HTTP program on a webserver sends an HTTP response message to a client PC, in what field of what message will it place the value 80? 2-5. Do the following without using a cal- culator or computer, but check your answers with a calculator or a com- puter. a) Convert 6 to binary. (Answer: 110) b) Convert 47 to binary. c) Convert 100 to binary. d) Convert 110100 to deci- mal. (Answer: 52) e) Convert 001100 to decimal. 2-6. Do the following without using a cal- culator or a computer, but check your answers with a calculator or a com puter. You need to represent 1,026 dif- ferent city names. How many bits will this take if you give each city a different binary number? Explain your answer 2-7. a) The port number fields in TCP and UDP are 16 bits long. How many port numbers can they represent? b) In IP, the Time to Live Field is 8 bits in size. How many values can it represent? c) How many values can a flag field represent? Comments). Select one of the RFCs listed on the page and write a para- graph on its claimed purpose. (Don't Client 60.171.18.22 Webserver 1.33.17.13 Port 80 Source: 60.171.18.22:2707 Destination: 1.33.17.13:80 3 Source: 1.33.17.13:80 Destination: 60.171.18.22:2707 4 Source: 60.171.18.22:4400 Destination: 123.30.17.120:25 SMTP Server 123.30.17.120 Port 25 Server Programs use Well-Known Port Numbers (0 to 1023) Client Uses Ephemeral Port Number 2700 with the Webserver 4400 with the SMTP Server 2 Clients use Ephemeral Port Numbers (usually 1024 to 4999) FIGURE 2-16 Client Port Numbers and Sockets

Answer 1

The to ahies in the ToP Prtocol establish a Gonnection before hy Can serd Rackts of dta to nnechon each othe Thi receiving the acknoes edgement Si Signal 3, a rant oe three-sep ↓ordslokia method όλ The Gomminicafion aed Ho she Loadsb I. Sounce initiates the ommunicotion, trasmts a sy Synchvon 2. Destnotion sends back an Ack acknock ment of the Sance SyN mes ji acknouo Greakl

cl an of the three o handso send SYN is transmitted menl.