Lesson 4 - Test

Question 1

True or false. UDP traffic accepts the loss of some data.

Answer 1

True

Question 2

What port is used by Kerberos?

Answer 2

88

Question 3

Which of the following protocols is considered connection-oriented?

Answer 3

TCP

Question 4

What port is used by RDS?

Answer 4

3389

Question 5

What port is used by LDAP?

Answer 5

389

Question 6

What is used to resolve an IP address to a MAC address?

Answer 6

ARP

Question 7

What type of traffic commonly uses UDP?

Answer 7

Streaming video Voice over IP Streaming audio

Question 8

In a DoD model, also known as a TCP/IP model, a TCP or UDP header is added to a message at different layers. Which of the following information is added to the source and destination port fields of the TCP header?

Answer 8

Source and destination port numbers identifying the upper layer protocol

Question 9

You work as an intern at uCertify Inc. Your company uses the Microsoft Outlook application as its email client. You need to explore the process of sending an email via SMTP as it is a part of your training. Choose and reorder the steps that complete the process of sending an email.

Answer 9

1. When the SMTP server receives the data from the client, it recognizes the destination port 25 as SMTP.
2. It then forwards the data to the service handling SMTP.
3. The server sends back an acknowledgement to the computer using port 49152 to confirm the email was received.
4. When the computer receives the packet with port 49152, it sends it to the Microsoft Outlook application.

Question 10

Match the protocols to their port numbers.

Answer 10

FTP: 20, 21

Telnet: 23

HTTP: 80

Secure HTTPS: 443

POP: 110

SMTP: 25

Question 11

Sally and Bob are the two users on the Internet. Sally wants to download a video file from Bob’s computer. Select the flags which will be used by them while establishing session using the TCP Handshake process and downloading the file.

Answer 11

Question 12

Which of the following layers of the OSI model defines the functions of TCP and UDP?

Answer 12

Transport

Question 13

Which of the following uses port 110 as a well-known port?

Answer 13

POP3

Question 14

Which of the following layers of the OSI reference model contains TCP?

Answer 14

Transport layer

Question 15

What is one way to protect data from unauthorized network clients prior to transferring it across the Internet?

Answer 15

Encryption

Question 16

Match TCP utilities with their descriptions

Answer 16

getmac: Displays the NIC’s MAC address
netstat: Displays a list of a computer’s active incoming and outgoing connections
ifconfig: Displays the host’s IP addressing information
telnet: Allows you to communicate with another computer on the network remotely
mtr: Combines the functionality of ping and traceroute

Question 17

Match TCP ports with their services

Answer 17

SMTP: 26

SFTP: 116

POP3: 110

Telnet: 23

NNTP: 119

FTP (data channel): 20

Question 18

Match UDP port numbers to their services

Answer 18

LDAP: 389

SSH and SCP: 22

DNS name queries: 53

SNMP: 161

IMAP: 143

FTPS (data channel): 989