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Question 1

What does the Data Link Layer do?

Answer 1

Layer takes data bits and frames and creates packets of the data. Layer adds source and desitnation address. This layer also handles error detection and correction.

Question 2

What is the Transport Layer and its functions (3)?

Answer 2

The transport layer is to transport data between the network devices.
- Error Checking
- Service Addressing
- Segmentation

Question 3

Name protocols are in the Session Layer?

Answer 3

NetBIOS
Network File System (NFS)
Server Message Block (SMB)

Question 4

Advantages of NFV (3)

Answer 4

Network function virtualisation allows for
- Scalability
- Better Cost
- Rapid Deployment

Question 5

Why do people use Authentication Header (AH) and Encapsulating Security Payload (ESP)

Answer 5

This ensures that the transmissions are not viewed, accessed or modified for people who do not have access for them

Question 5

Name 3 security services IP Sec Provides

Answer 5

• Data Verification
• Protection from data tampering
• Private transactions

Question 6

What is FTP

Answer 6

File Transfer Protocol is for uploading and downloading files from a remote host server

Question 7

What Transport protocol does FTP use for their service?

Answer 7

TCP

Question 8

What layer and port does FTP use?

Answer 8

Application Layer
Port 20 21

Question 9

What is SSH

Answer 9

Secure Shell which provides encryption as data travels between system

Question 10

What is SFTP

Answer 10

Secure File Transfer Protocol which is based on SSH offers encryption and robust authentication between the sender and receiver.

Question 11

What is Telnet and the port number

Answer 11

Telnet enables sessions to be opened on the remote host and let commands be executed on that host.
Port 23

Question 12

What is SMTP and port number

Answer 12

Simple Mail Transfer Protocol which defines how mail is sent between hosts. SMTP uses TCP as it guarantee error free delivery.
Port 25

Question 13

What is DNS and port number

Answer 13

Domain Name System which resolves hostnames
Port 53

Question 14

What is DHCP and port number

Answer 14

Dynamic Host Control Protocol enables a range of IP addresses. This is an address pool where the server allocates addresses to clients. DHCP client ask the server to lease the address
Port 67 68

Question 15

What is TFTP and port number

Answer 15

Trivial File Transfer Protocol is a variation of FTP. TFTP requires you to request what you want in the exact location. TFTP uses UDP
Port 69

Question 16

What is HTTP and HTTPS and port number

Answer 16

Hypertext Transfer Protocol defines the actions can be requested by the client and how the server responds. This enables text, graphics and multimedia to be downloaded.
Port 80 and 443 for HTTPS

Question 17

What is NTP and port number

Answer 17

Network time Protocol is part of TCP/IP which facilitate time communication between systems. NTP operates on UDP
Port 123

Question 18

What is POP3 and IMAP4 and port number

Answer 18

Post Office Protocol Version 3 and Internet Message Access Protocol Version 4 are use to download pull email from the server.
POP3 110 and IMAP4 143

Question 19

What is the issue with POP3

Answer 19

When accessing the mailbox the password is transmitted in plain text over the network

Question 20

What is the issue with FTP

Answer 20

FTP offers a weak security mechanism to authenticate users.

Question 21

What is SNMP

Answer 21

Simple Network Management Protocol is a protocol exchanged management information between the network devcies

Question 22

Name 2 components used in SNMP

Answer 22

• Central system which is the Manager
• SNMP agent which is devices communicating with the manager

Question 23

What is NMS

Answer 23

Network Management System which run queries built into the application.

Question 24

How does SNMP and NMS work together

Answer 24

They work together to monitor all devices on the network such as switches, routers, hubs, servers and printers

Question 25

What are the commands for SNMP (4)

Answer 25

1. Get
2. Get Next
3. Set
4. Walk

Question 26

What is MIBs

Answer 26

Management Information Base is when you have a giant list and need to know how to manage it

Question 27

What are SNMP Communities

Answer 27

SNMP communities are logical grouping systems. The communities are configured with same labelling

Question 28

What does SNMPv3 provide

Answer 28

It provides authentication and encryption

Question 29

What is LDAP

Answer 29

Lightweight Directory Access Protocol to provide a mechanism to access and query directory service systems

Question 30

What is SMB

Answer 30

Server Block Message is a network providing resources such as files and printers running on Windows.

Question 31

What is syslog

Answer 31

A Unix system to write messages to log files

Question 32

SMTPS

Answer 32

Simple Mail Transfer Protocol Secure (SMTPS) uses TLS to provide authentication. It wraps the data in TLS providing integrity and confidentiality

Question 33

What is LDAPS

Answer 33

LDAP over SSL. Upon connecting the client and server establishes a TLS session before any messages.

Question 34

What is SQL

Answer 34

Structured Query Language is a database language. It allows queries to be configured in real time and passed to the database

Question 35

What is RDP

Answer 35

Remote Desktop Protocol is used on a Windows environment for remote connection. RDP operates the server as if it was a local client called thin client computing

Question 36

How does RDP work

Answer 36

RDP does not send actual data only screenshots and keystrokes

Question 37

What is SIP

Answer 37

Session Initiation Protocol which designed to establish and maintain multimedia in the application layer