Question

ANSWER THESE NETWORK QUESTIONS, READ THEM CAREFULLY(1- 7)

These are Computer Networks Questions, Calculations & MCQS

1. "Host A is sending a file to Host B. There are 3 links (therefore 2 switches) between the hosts. The file is segmented into packets of 40 bytes, with a 10 byte header added to each packet. Each link has a transmission rate of 100 kbps and a speed of 1000 km per sec. The switches are 100km away from each other. Host A is 50 km away from the first switch while Host B is 150 km away from the second switch. Data travels from Host A to the first switch, on to the second switch and then to Host B. What is the total transmission delay (in seconds) experienced?"

2. "Host A sends real time voice to Host B over a packet switched network. Host A first converts the analogue voice signal to a digital signal at a rate of 64 kbps. Host A then creates packets of data where each packet contains 56 bytes. Once a packet is created by Host A, it is sent to Host B over a link that operates at a 2 Mbps transmission rate. The propagation delay is 10 milliseconds. (Remember to convert bytes to bits). How long (in seconds) does it take to create the packet of data, transmit it onto the link and send along the link to Host A?"

3.

Two parallel TCP connections (a control connection and a data connection) are used in the following protocol/s:

		HTTP
		SMTP
		FTP
		All of the above
		None of the above

4.

For domains such as com, org, edu, fr, uk, the following server exists:

		Top level domain server
		Root server
		Authoritative server
		CDN server
		None of the above

5.

Which protocol allows the user to view email message instead of downloading them from a hierarchy on a remote server.

		SMTP
		FTP
		IMAP
		All of the above
		None of the above

6.

Name 1 languages that the browser is willing to accept in the following message?

GET /kurose_ross/interactive/quotation7.htm HTTP/1.1
Host: gaia.cs.umass.edu
Accept: text/plain, text/html, image/gif, image/jpeg, audio/mpeg, audio/basic, video/wmv, video/mp4, application/*, */*
Accept-Language: en, fr, de, ar, cs
If-Modified-Since: Mon, 12 Aug 2019 07:13:47 -0700
User Agent: Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko/20100101 Firefox/11.0

7. A file of size F = 8 Gbits needs to be distributed to10 peers. Suppose the server has an upload rate of u = 68 Mbps, and that the 10 peers have upload rates of: u1 = 20 Mbps, u2 = 22 Mbps, u3 = 12 Mbps, u4 = 19 Mbps, u5 = 25 Mbps, u6 = 24 Mbps, u7 = 18 Mbps, u8 = 11 Mbps, u9 = 14 Mbps, u10 = 30 Mbps, and download rates of: d1 = 28 Mbps, d2 = 30 Mbps, d3 = 12 Mbps, d4 = 20 Mbps, d5 = 18 Mbps, d6 = 15 Mbps, d7 = 14 Mbps, d8 = 34 Mbps, d9 = 20 Mbps, d10 = 34 Mbps. What is the minimum time needed to distribute this file from the central server to the 10 peers using the client-server model (round to the nearest second)?

Answer 1