Networking - TCP sockets - multichoice questions

Question 1

For a communication session between a pair of programs, which program is the client and which is the server?

The program that initializes the TCP connection is the client
The program that initializes the TCP connection is the server

Question 2

In TCP/IP networking, what parameter is used to specify a particular process on a machine?

IP address
window size
port number
protocol
None of the above

Question 3

What file contains a catalog of well known services?

/etc/services
/etc/protocols
/usr/share/net/services
/usr/share/net/protocols
None of the above

Question 4

Which port number serves as a boundary between privileged and non-privileged ports?

25
991
1024
6000
65535

Question 5

If on one machine, elvis was using both the Firefox and Chrome web browsers to access the same website, what parameter would differ for the two involved sockets?

The client IP Address
The server port number
The client port number
The server IP Address
None of the above

Question 6

When a socket is opened by a server and awaiting client connections, what state is the socket said to be in?

Waiting
Listening
Established
Initialized
None of the above

Use the following transcript to answer the next 4 questions.

[elvis@station elvis]$ netstat -tuna
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address       Foreign Address         State
tcp   0     0   127.0.0.1:32768     0.0.0.0:*               LISTEN
tcp   0     0   0.0.0.0:111         0.0.0.0:*               LISTEN
tcp   0     0   0.0.0.0:6000        0.0.0.0:*               LISTEN
tcp   0     0   0.0.0.0:22          0.0.0.0:*               LISTEN
tcp   0     0   69.57.79.162:53     0.0.0.0:*               LISTEN
tcp   0     0   192.168.0.254:53    0.0.0.0:*               LISTEN
tcp   0     0   127.0.0.1:53        0.0.0.0:*               LISTEN
tcp   0     0   0.0.0.0:631         0.0.0.0:*               LISTEN
tcp   0     0   127.0.0.1:25        0.0.0.0:*               LISTEN
tcp   0     0   127.0.0.1:953       0.0.0.0:*               LISTEN
tcp   0     0   127.0.0.1:6010      0.0.0.0:*               LISTEN
tcp   0     0   127.0.0.1:631       127.0.0.1:32773         ESTABLISHED
tcp   0     48  69.57.79.162:22     66.187.233.200:35954    ESTABLISHED

[elvis@station elvis]$ grep 53 /etc/services
domain      53/tcp          # name-domain server
domain      53/udp           
gdomap      538/tcp         # GNUstep distributed objects
gdomap      538/udp         # GNUstep distributed objects
cfengine    5308/tcp        # CFengine
cfengine    5308/udp        # CFengine
knetd       2053/tcp        # Kerberos de-multiplexor
rndc        953/tcp         # rndc control sockets (BIND 9)
rndc        953/udp         # rndc control sockets (BIND 9)

Question 7

Choose the correct sentence.

69.57.79.162 is connected to elvis station, while elvis is using the default port of SSH protocol
66.187.233.200 is connected to elvis station, while elvis is using the default port of SSH protocol
69.57.79.162 is connected to elvis station, while elvis is using port 35954
66.187.233.200 is connected to elvis station, while elvis is using port 35954
None of the above

Question 8

How many TCP/IP clients are currently connected to services on elvis machine?

1
0
2
11
None of the above

Question 9

Of these, how many are on remote machines?

1
0
11
2
None of the above

Question 10

The three sockets bound to port 53 most likely belong to what service?

SSH (Secure Shell)
HTTP (Hypertext Transfer Protocol)
FTP (File Transfer Protocol)
DNS (Domain Name Service)
TELNET (Telnet Service)

Question 11

Which of the below characteristics are typically associated with a TCP socket?

The syscall socket(AF_INET, SOCK_DGRAM, 0) creates the socket of type TCP.
TCP sockets provide reliable, in-order byte-stream transfer between client and server.
The syscall call socket(AF_INET, SOCK_STREAM, 0) creates a socket of type TCP.
The server uses accept() function for incoming client connections.
Data from multiple clients can be received on the same socket.
When a server is contacted by a client, it creates a new server-side socket to communicate with that client.

Question 12

In TCP, how does the server know the client IP address and the port number to reply to in response to a received message?

Using the DNS protocol
Every message sent by the client contains the IP number and port.
The accept() syscall creates a new socket that is bound to the specific client, which is established using the IP and port number of the client.
The server looks for the correct port number in the /etc/services file.

Question 13

In UDP, how does the server know the client IP address and the port number to reply to in response to a received message?

Using the DNS protocol
Every message sent by the client contains the IP number and port.
The accept() syscall creates a new socket that is bound to the specific client, which is established using the IP and port number of the client.
The server looks for the correct port number in the /etc/services file.

Question 14

A given server has 5 established TCP connections bound to port 80, how many socket files the server holds?

5
6
1
None of the above