Question 1

UDP (User Datagram Protocol)

Accepted Answer

A)  belongs to the data link layer. 
B)  is frequently used by real-time applications. 
C)  provides a connection-oriented service. 
D)  belongs to the network layer. 
E)  Issues an acknowledgment when a packet is received. 
A)  belongs to the data link layer. 
B)  is frequently used by real-time applications. 
C)  provides a connection-oriented service. 
D)  belongs to the network layer. 
E)  Issues an acknowledgment when a packet is received.

Question 2

Which is NOT correctly paired in terms of the software or hardware of a host computer that implements each layer function? Choose the least relevant.
$$\begin{array} { | l | l | } 
\hline { \text { Layers } } & \text { Implementation } \
\hline \text { A) Application } & \text { Application } \
\hline \text { B) Transport } & \text { Operating System } \
\hline \text { C) Internet/network } & \text { Operating System } \
\hline \text { D) Data link } & \text { Operating System } \
\hline \text { E) Physical } & \text { Network Interface Card } \
\hline
\end{array}$$

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 3

In TCP, which party should decide whether to retransmit a lost or damaged segment?

Accepted Answer

A)  the original sender station 
B)  the receiver station 
C)  either the sender or the receiver station depending on the situation. 
D)  the first router that connects the sender station to the Internet 
E)  the first router that connects the receiver station to the Internet 
A)  the original sender station 
B)  the receiver station 
C)  either the sender or the receiver station depending on the situation. 
D)  the first router that connects the sender station to the Internet 
E)  the first router that connects the receiver station to the Internet

Question 4

SYN and ACK are exchanged for _______ between two hosts:

Accepted Answer

A)  session establishment 
B)  data exchange 
C)  pinging 
D)  detection of transmission errors 
E)  detection of lost messages 
A)  session establishment 
B)  data exchange 
C)  pinging 
D)  detection of transmission errors 
E)  detection of lost messages

Question 5

Below message is generated at the _____ layer:
"GET / /HTTP 1.1
Host: www.whitehouse.gov"

Accepted Answer

A)  application 
B)  transport 
C)  internet 
D)  data link 
E)  physical 
A)  application 
B)  transport 
C)  internet 
D)  data link 
E)  physical

Question 6

As for TCP and UDP, which statement is CORRECT?

Accepted Answer

A)  Both are connection-oriented protocol. 
B)  Both are defined at the transport layer of TCP/IP. 
C)  Both are reliable protocol. 
D)  TCP is better than UDP in handling real-time traffic. 
E)  Both undertake the detection and correction of transmission errors. 
A)  Both are connection-oriented protocol. 
B)  Both are defined at the transport layer of TCP/IP. 
C)  Both are reliable protocol. 
D)  TCP is better than UDP in handling real-time traffic. 
E)  Both undertake the detection and correction of transmission errors.

Question 7

Which statement is true?

Accepted Answer

A)  The official address of the Internet is the host name. 
B)  IP packets contain a header, a data, and a trailer fields. 
C)  OSI standards are more popular than TCP/IP standards in the application layer. 
D)  International Standard Organization (ISO) is responsible for developing TCP/IP standards. 
E)  TCP/IP standards dominate the internet layer. 
A)  The official address of the Internet is the host name. 
B)  IP packets contain a header, a data, and a trailer fields. 
C)  OSI standards are more popular than TCP/IP standards in the application layer. 
D)  International Standard Organization (ISO) is responsible for developing TCP/IP standards. 
E)  TCP/IP standards dominate the internet layer.

Question 8

In the screenshot below, I just
   
A) temporarily assigned an IP to a host.
B) contacted a server with the IP address of 127.0.0.1.
C) broadcasted a packet to the subnet of 127.0.0.x.
D) obtained the MAC address of 127.0.0.1.
E) tested my computer's TCP/IP protocol stack.

Accepted Answer

The answer of In the screenshot below, I just
 ...

Question 9

The real-life analogy of an IP packet is:

Accepted Answer

A)  the Jayne's letter to Brian 
B)  the airplane that delivers the Jayne's letter 
C)  the envelop that contains the Jayne's letter 
D)  Jayne and Brian's mailing addresses 
E)  Jayne and Brian's houses 
A)  the Jayne's letter to Brian 
B)  the airplane that delivers the Jayne's letter 
C)  the envelop that contains the Jayne's letter 
D)  Jayne and Brian's mailing addresses 
E)  Jayne and Brian's houses

Question 10

Apache is a(n):

Accepted Answer

A)  email server program 
B)  DNS server program 
C)  DHCP server program 
D)  HTTP (or web) server program 
E)  Operating system 
A)  email server program 
B)  DNS server program 
C)  DHCP server program 
D)  HTTP (or web) server program 
E)  Operating system

Question 11

________ is an application layer protocol that enables mapping between host names and their IP addresses.

Accepted Answer

A)  SMTP 
B)  DNS 
C)  IRC 
D)  SSH 
E)  SNMP 
A)  SMTP 
B)  DNS 
C)  IRC 
D)  SSH 
E)  SNMP

Question 12

Choose an INCORRECT statement on the transport layer process.

Accepted Answer

A)  The port information should be found in the transport layer's TCP segment. 
B)  The port information should be found in the transport layer's UDP datagram. 
C)  Opening a TCP connection needs the handshaking process to establish a session. 
D)  The normal termination of a TCP connection takes exchange of several packets. 
E)  Transporting multiple files necessary to construct a web page takes one TCP session (assume that HTTP1.1 is used). 
A)  The port information should be found in the transport layer's TCP segment. 
B)  The port information should be found in the transport layer's UDP datagram. 
C)  Opening a TCP connection needs the handshaking process to establish a session. 
D)  The normal termination of a TCP connection takes exchange of several packets. 
E)  Transporting multiple files necessary to construct a web page takes one TCP session (assume that HTTP1.1 is used).

Question 13

When a workstation tries to communicate with a server (ex. www.cnn.com), which of these is a possible port number of the sender ?

Accepted Answer

A)  80 
B)  21 
C)  58 
D)  110 
E)  65000 
A)  80 
B)  21 
C)  58 
D)  110 
E)  65000

Question 14

When does TCP of a host station decide to retransmit a segment?

Accepted Answer

A)  When it does not receive an acknowledgment from the receiver. 
B)  Never. TCP is not capable of retransmitting segments. 
C)  When the neighboring switch requests a retransmission due to a lost segment. 
D)  When the neighboring router requests a retransmission due to a lost segment. 
E)  When a TCP connection is not properly closed. 
A)  When it does not receive an acknowledgment from the receiver. 
B)  Never. TCP is not capable of retransmitting segments. 
C)  When the neighboring switch requests a retransmission due to a lost segment. 
D)  When the neighboring router requests a retransmission due to a lost segment. 
E)  When a TCP connection is not properly closed.

Question 15

Choose a CORRECT statement on the flag field bit of the TCP segment.

Accepted Answer

A)  The ACK bit is used to initiate a session. 
B)  The SYN bit is used to acknowledge packet arrival. 
C)  The END bit is used to terminate a session. 
D)  The INI bit is used to initiate a session. 
E)  The FIN bit is used to terminate a session. 
A)  The ACK bit is used to initiate a session. 
B)  The SYN bit is used to acknowledge packet arrival. 
C)  The END bit is used to terminate a session. 
D)  The INI bit is used to initiate a session. 
E)  The FIN bit is used to terminate a session.

Question 16

I am trying to reach a web server, www.chicago.edu. The response message from the DNS server tells my computer the _____.

Accepted Answer

A)  domain name of the www.chicago.edu server 
B)  IP address of the www.chicago.edu server 
C)  Default gateway address of the www.chicago.edu server 
D)  ISP of www.chicago.edu 
E)  MAC address of the www.chicago.edu server 
A)  domain name of the www.chicago.edu server 
B)  IP address of the www.chicago.edu server 
C)  Default gateway address of the www.chicago.edu server 
D)  ISP of www.chicago.edu 
E)  MAC address of the www.chicago.edu server

Question 17

Which statement is CORRECT on the connection-orientation/reliability of communications?

Accepted Answer

A)  Connectionless services have explicit openings and closings. 
B)  Almost all protocols currently in use are connection-oriented and reliable in nature. 
C)  Reliable protocols resend lost or damaged messages. 
D)  TCP is the only unreliable protocol. 
E)  TCP is a connection-less protocol that does not need handshaking. 
A)  Connectionless services have explicit openings and closings. 
B)  Almost all protocols currently in use are connection-oriented and reliable in nature. 
C)  Reliable protocols resend lost or damaged messages. 
D)  TCP is the only unreliable protocol. 
E)  TCP is a connection-less protocol that does not need handshaking.

Question 18

ICMP messages are encapsulated in the data field of _________ for transmission.

Accepted Answer

A)  IP 
B)  TCP 
C)  UDP 
D)  DNS 
E)  HTTP 
A)  IP 
B)  TCP 
C)  UDP 
D)  DNS 
E)  HTTP

Question 19

Which is NOT a PDU(Protocol Data Unit) ?

Accepted Answer

A)  Frame 
B)  Packet 
C)  Segment 
D)  Datagram 
E)  HTTP 
A)  Frame 
B)  Packet 
C)  Segment 
D)  Datagram 
E)  HTTP

Question 20

Establishing a logical connection(or handshaking) between two computers requires the exchange of __________ messages.

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  5 
A)  0 
B)  1 
C)  2 
D)  3 
E)  5

UDP (User Datagram Protocol)

In TCP, which party should decide whether to retransmit a lost or damaged segment?

SYN and ACK are exchanged for _______ between two hosts:

Below message is generated at the _____ layer: "GET / /HTTP 1.1 Host: www.whitehouse.gov"

As for TCP and UDP, which statement is CORRECT?

Which statement is true?

In the screenshot below, I just A) temporarily assigned an IP to a host. B) contacted a server with the IP address of 127.0.0.1. C) broadcasted a packet to the subnet of 127.0.0.x. D) obtained the MAC address of 127.0.0.1. E) tested my computer's TCP/IP protocol stack.

The real-life analogy of an IP packet is:

Apache is a(n):

________ is an application layer protocol that enables mapping between host names and their IP addresses.

Choose an INCORRECT statement on the transport layer process.

When a workstation tries to communicate with a server (ex. www.cnn.com), which of these is a possible port number of the sender ?

When does TCP of a host station decide to retransmit a segment?

Choose a CORRECT statement on the flag field bit of the TCP segment.

I am trying to reach a web server, www.chicago.edu. The response message from the DNS server tells my computer the _____.

Which statement is CORRECT on the connection-orientation/reliability of communications?

ICMP messages are encapsulated in the data field of _________ for transmission.

Which is NOT a PDU(Protocol Data Unit) ?

Establishing a logical connection(or handshaking) between two computers requires the exchange of __________ messages.

Networking: Fundamental Concepts

Cybersecurity: Fundamentals

Ip Address Planning and Management

Intermediary Devices

Wi-Fi and Cellular Network

Ethernet Lan

Cybersecurity: Threats

Cybersecurity: Network and Host Protection

Cybersecurity: Data Protection

Fundamentals of Packet Routing

Wide Area Network

Physical Layer Data Transmissions

Enterprise Network: LAN Topology, Routing, and Connectivity

Filters

Exam 3: Essential Layers of Computer Networking

UDP (User Datagram Protocol)

In TCP, which party should decide whether to retransmit a lost or damaged segment?

SYN and ACK are exchanged for _______ between two hosts:

Below message is generated at the _____ layer: "GET / /HTTP 1.1 Host: www.whitehouse.gov"

As for TCP and UDP, which statement is CORRECT?

Which statement is true?

In the screenshot below, I just A) temporarily assigned an IP to a host. B) contacted a server with the IP address of 127.0.0.1. C) broadcasted a packet to the subnet of 127.0.0.x. D) obtained the MAC address of 127.0.0.1. E) tested my computer's TCP/IP protocol stack.

The real-life analogy of an IP packet is:

Apache is a(n):

________ is an application layer protocol that enables mapping between host names and their IP addresses.

Choose an INCORRECT statement on the transport layer process.

When a workstation tries to communicate with a server (ex. www.cnn.com), which of these is a possible port number of the sender ?

When does TCP of a host station decide to retransmit a segment?

Choose a CORRECT statement on the flag field bit of the TCP segment.

I am trying to reach a web server, www.chicago.edu. The response message from the DNS server tells my computer the _____.

Which statement is CORRECT on the connection-orientation/reliability of communications?

ICMP messages are encapsulated in the data field of _________ for transmission.

Which is NOT a PDU(Protocol Data Unit) ?

Establishing a logical connection(or handshaking) between two computers requires the exchange of __________ messages.

Networking: Fundamental Concepts

Cybersecurity: Fundamentals

Ip Address Planning and Management

Intermediary Devices

Wi-Fi and Cellular Network

Ethernet Lan

Cybersecurity: Threats

Cybersecurity: Network and Host Protection

Cybersecurity: Data Protection

Fundamentals of Packet Routing

Wide Area Network

Physical Layer Data Transmissions

Enterprise Network: LAN Topology, Routing, and Connectivity

Filters