Domain 1: Networking Concepts

Question 1

What is SSH?

Answer 1

Secure Shell
Default Port: TCP/22
Encrypted

Question 2

What is DNS?

Answer 2

Domain Name System
Default Port: UDP/53
Used for name resolution

Question 3

What is Telnet?

Answer 3

Telecommunication Network
Default Port: TCP/23
Unencrypted
Used to login to devices remotely / Console Access.

Question 4

What is SMTP?

Answer 4

Simple Mail Transfer Protocol
Default Port: TCP/25
Used to send/receive E-Mails

Question 5

What is POP3?

Answer 5

Post office Protocol 4
Default Port: TCP/110
Basic mail transfer

Question 6

What is IMAP(v4)?

Answer 6

Internet Message Access Protocol v4
Default Port: TPC/143
Allows multiple clients to manage e-mails

Question 7

What is SFTP?

Answer 7

SSH File Transfer Protocol
Default Port: TCP/22
Encrypted

Question 8

What is FTP?

Answer 8

File Transfer Protocol
Default Port:
 - TCP/20 (Active Mode / Data Transfer)
 - TCP/21 (Control Information)
Authenticates with a username/password
Unecrypted

Question 9

What is TFTP?

Answer 9

Trivial File Transfer Protocol
Default Port: UDP/69
Doesn’t use authentication
Unecrypted

Question 10

What is DHCP

Answer 10

Dynamic Host Configuration Protocol
Default Port: UDP/67, UDP/68
Automatic network configuration

Question 11

What is http(s)?

Answer 11

Hypertext Transfer Protocol (Secure)
Default Port: TCP/80 (TCP/443)
Web server communication
http -> Unencrypted
https -> Encrypted

Question 12

What is SNMP?

Answer 12

Simple Network Management Protocol
Default Port: UDP/161
Different Versions:
 - v1, v2 Unencrypted
 - v3 Encrypted + Authentication

Question 13

What is RDP?

Answer 13

Remote Destkop Protocol
Default Port: TCP/3389
Can connect to an entire desktop oder only an application

Question 14

What is NTP?

Answer 14

Network Time Protocol
Default Port: UDP/123
Used to synchronized the clock between network devices

Question 15

What is SIP?

Answer 15

Session Initiation Protocol
Default Ports: TCP/5060 + TCP/5061
Used for Voice over IP (VoIP) signaling

Question 16

What is SMB?

Answer 16

Server Message Block
also known as Common Internet File System (CIFS)
Default Ports: TCP/445

Question 17

What is LDAP(S)?

Answer 17

Lightweight Directory Access Protocol (Secure)

Default Port: TCP/389 (TCP/636)

Question 18

What is H.323?

Answer 18

Default Port: TCP/1720

Used for Voice over IP (VoIP) signaling

Question 19

What is OSI Model?

Answer 19

Open Systems Interconnection Reference Model

Question 20

What is OSI Layer 1?

Answer 20

Physical Layer

cables, connectors and the signal itself

Question 21

What is OSI Layer 2?

Answer 21

Data Link Layer or Switching Layer

Frame, MAC Address, Extended Unique Identifier,

Question 22

What is OSI Layer 3?

Answer 22

Network Layer or Routing Layer

• IP adresses, Hostname
• Fragmentation

Question 23

What is OSI Layer 4?

Answer 23

Transport Layer

Protocols (TCP/UDP) and Ports

Question 24

What is OSI Layer 5?

Answer 24

Session Layer
Communication management (start, stop, restart)

Question 25

What is OSI Layer 6?

Answer 25

Presentation Layer
Character encondig
En-/decryption

Question 26

What is OSI Layer 7?

Answer 26

Application Layer

The software itself