When I google the answers I founded them but did not understand them
Try it
It's for computer science
Review: The TCP/IP network does not now how to route l) Exercise Two using names, such as www.yahoo.com, It Open "Wireshark", then use the "File" menu and the "Open" only knows how to command to open the file "Exercise Two.pcap". You should se 176 packets listed. route using IP addresses. Therefore a common name a) In the first few packets, the client machine is looking up (CNAME), such as www.yahoo.com the common name (cname) of a web site to find its IP address. What is the cname of this web site? Give two IP addresses for this web site. must be translated to an IP address, like b) How many packets/frames does it take to receive the c) Does this web site use gzip to compress its data for web page (the answer to the first http get request only)? 216.109.117.106 before your computer can request a web page sending? Does it write cookies? In order to answer these questions, look under the payload for the reassembled packet that represents the web page. This will be the last packet from question b above. Look to see if it has "Content-Encoding" set to gzip, and to see if it has a "Set-Cookie" to write a cookie. Your computer uses a DNS request to lookup a CNAME and it gets back a set of IP addresses (a primary address and one or more backup d) What is happening in packets 26 and 27? Does every component of a web page have to come from the same server? See the Hint to the left. In packet 37 we see another DNS query, this time for us.il.yimg.com. Why does the client need to ask for this IP address? Didn't we just get this address in packet 267 is a trick question: carefully compare the two common names in packet 26 and 37.) In packet 42 we see a HTTP "Gef" statement, and in packet 48 a new HTTP "Get" statement. Why didn't the system need another DNS request before the second get statement? Click on packet 42 and look in the middle window. Expand the line titled "Hypertext Transfer Protocol" and read the "Host: line. Compare that line to the "Host:" line for packet 48. e) addresses) that can be used to contact the server f) Hint: See the accompanying document titled the QuickStart Guide g) Examine packet 139. It is one segment of a PDU that is Look under the appendix describing Hits Versus Page reassembled with several other segments in packet 160 at packets 141, 142, and 143. Are these three packets also part of packet 160? What happens if a set of packets that are supposed to be reassembled do not arrive in a continuous stream or do not arrive in the proper order? h) Return to examine frames 141 and 142. Both of these are graphics (GIF files) from the same source IP address. How does the client know which graphic to match up to each get satement? Hint Click on each Review: The TCP/IP network does not now how to route l) Exercise Two using names, such as www.yahoo.com, It Open "Wireshark", then use the "File" menu and the "Open" only knows how to command to open the file "Exercise Two.pcap". You should se 176 packets listed. route using IP addresses. Therefore a common name a) In the first few packets, the client machine is looking up (CNAME), such as www.yahoo.com the common name (cname) of a web site to find its IP address. What is the cname of this web site? Give two IP addresses for this web site. must be translated to an IP address, like b) How many packets/frames does it take to receive the c) Does this web site use gzip to compress its data for web page (the answer to the first http get request only)? 216.109.117.106 before your computer can request a web page sending? Does it write cookies? In order to answer these questions, look under the payload for the reassembled packet that represents the web page. This will be the last packet from question b above. Look to see if it has "Content-Encoding" set to gzip, and to see if it has a "Set-Cookie" to write a cookie. Your computer uses a DNS request to lookup a CNAME and it gets back a set of IP addresses (a primary address and one or more backup d) What is happening in packets 26 and 27? Does every component of a web page have to come from the same server? See the Hint to the left. In packet 37 we see another DNS query, this time for us.il.yimg.com. Why does the client need to ask for this IP address? Didn't we just get this address in packet 267 is a trick question: carefully compare the two common names in packet 26 and 37.) In packet 42 we see a HTTP "Gef" statement, and in packet 48 a new HTTP "Get" statement. Why didn't the system need another DNS request before the second get statement? Click on packet 42 and look in the middle window. Expand the line titled "Hypertext Transfer Protocol" and read the "Host: line. Compare that line to the "Host:" line for packet 48. e) addresses) that can be used to contact the server f) Hint: See the accompanying document titled the QuickStart Guide g) Examine packet 139. It is one segment of a PDU that is Look under the appendix describing Hits Versus Page reassembled with several other segments in packet 160 at packets 141, 142, and 143. Are these three packets also part of packet 160? What happens if a set of packets that are supposed to be reassembled do not arrive in a continuous stream or do not arrive in the proper order? h) Return to examine frames 141 and 142. Both of these are graphics (GIF files) from the same source IP address. How does the client know which graphic to match up to each get satement? Hint Click on each
