Question

I NEED HELP WITH NETWORKS ( 1 - 11) QUESTIONS , ENSURE YOU ANSWER THEM ALL

QUESTION 1

1. Which of the following could be valid DNS resource record entries?

   		(mysite.com, 125.245.206.3, NS)
   		(ibm.com, backup6.ibm.com, CNAME)
   		(158.223.21.2, mypage.edu, A)
   		All of the above
   		None of the above

1 points   

QUESTION 2

1. Which mail protocol keeps state information across sessions?

   		SMTP
   		POP3
   		IMAP
   		All of the above
   		None of the above

1 points   

QUESTION 3

1. What type of message is the following?       

   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

   		HTTP request
   		HTTP response
   		SMTP
   		DNS request
   		None of the above

1 points   

QUESTION 4

1. Which of the following is NOT an application layer protocol?

   		HTTP
   		FTP
   		BitTorrent
   		SMTP
   		None of the above

1 points   

QUESTION 5

1. 1.     Consider the following excerpt from a simple server side UDP program:

   Server.py

   from socket import *

   sName=’127.0.0.1’

   sSocket=socket(AF_INET,SOCK_DGRAM)

   sSocket.bind((sName, 12005))

   while True:

   msg, cAddr =sSocket.recvfrom(2048)

   newMsg = msg.decode().lower()

     sSocket.sendto(newMsg.encode(), cAddr)

   After receiving how many packets of data is this UDP socket closed by the server?

   		1
   		2048
   		10
   		No limit
   		None of the above

1 points   

QUESTION 6

1. An IP address:

   		Identifies a host
   		Is a 32-bit value
   		Can be found in DNS resource records
   		All of the above
   		None of the above

1 points   

QUESTION 7

1. Which statement / statements are true of the TCP transport protocol?

   		The client and server exchange control information before the application message flows
   		Handshaking is used to establish a connection between client and server
   		Connections exist between sockets of the two processes
   		All of the above
   		None of the above

1 points   

QUESTION 8

1. Consider the following excerpt from a simple server side TCP program. Server.py

   from socket import *

   serverPort=12000

   serverSocket= socket(******************)

   serverSocket.bind(('',serverPort))

   serverSocket.listen(1)

   connectionSocket, addr = serverSocket.accept()

   while 1:

   sentence = connectionSocket.recv(1024)

   print 'From Server:', sentence, '\n'

   serverSocket.close()

   Which of the following could be used to replace the *********** in line 2?

   		AF_INET,SOCK_STREAM
   		SOCK_STREAM
   		AF_INET,SOCK_DGRAM
   		SOCK_DGRAM
   		None of the above

1 points   

QUESTION 9

1. How does Post Office Protocol access mail?

   		Using download and deleting
   		Using download and keep
   		Using authenticate, retrieve and update phases
   		Using SMTP
   		None of the above

1 points   

QUESTION 10

1. With reference to The Domain Name service, choose the most correct option:

   		Translates hostnames to IP addresses
   		Is implemented as a collection of distributed databases
   		Is implemented in a hierarchical architecture
   		All of the above
   		None of the above

1 points   

QUESTION 11

1. 1.     Consider the following excerpt from a simple client side TCP program:

   Client.py

   from socket import *

   sName=’xyz’

   sPort=12002

   cSocket=socket(AF_INET,SOCK_STREAM)

   cSocket.connect((************))

   cSocket.send (‘Welcome to Socket programming’.encode())

   newText=cSocket.recv(1024)

   print ('From Server:', newText.decode(), '\n')

   cSocket.close()

   Which of the following could be used to replace the *********** in line 5?

   		sPort
   		12000
   		‘’, serverPort
   		'',sPort
   		None of the above

1 points   

Answer 1

1. All of the above

Explanation: All of them are valid DNS resource record entries.

2. POP3

Explanation: During a POP3 session between a user agent and the mail server, the POP3 server maintains some state information; in particular, it keeps track of which user messages have been marked deleted.

3. HTTP request

Explanation: This is an example of HTTP request.

4. BitTorrent

Explanation: Except BitTorrent, every protocol is an application layer protocol.

NOTE: As per Chegg policy, I am allowed to answer specific number of questions (including sub-parts) on a single post. Kindly post the remaining questions separately and I will try to answer them. Sorry for the inconvenience caused