1.1 - Ports and Protocols Flashcards
1
Q
TCP and UDP (3)
A
- Encapsulated inside IP protocol
- OSI Layer 4 (transport)
- Multiplexing, different apps at same time
2
Q
TCP (3)
A
- Reliable
- Flow control, the receiver can manage how much data is sent
- 3 way handshake
3
Q
UDP (3)
A
- Connection less
- No open or close
- No flow control, sender determines amount of data sent
4
Q
Non-Ephemeral Ports (2)
A
- Permanent ports
- 0-1023
5
Q
Ephemeral Ports (2)
A
- Temporary port numbers
- 1024-65535
6
Q
ICMP - Internet Control Message Protocol (3)
A
- Protocol carried by IP protocol
- “Text messaging” for network devices
- Devices can request and reply to admin requests, “hey you there?” “Yes, I’m here”.
7
Q
Telnet (6)
A
Telecommunication network
- TCP/23
- Provides authentication
- Log into devices remotely
- Console access
- Not encrypted
8
Q
SSH (3)
A
Secure Shell
- TCP/22
- Same as Telnet but encrypted
9
Q
DNS (2)
A
Domain Name System
- UDP/53
10
Q
SMTP (5)
A
Simple Mail Transfer Protocol
- TCP/25
- Sending only
- Server to server
- Device to server
11
Q
SFTP (3)
A
Secure File Transfer Protocol
- TCP/22
- Encrypted, using SSH (uses same port)
12
Q
FTP (5)
A
File Transfer Protocol
- TCP/20, Active mode data
- TCP/21, Control
13
Q
TFTP (4)
A
Trivial File Transfer Protocol
- UDP/69
- No authentication
- Only read/write files
14
Q
DHCP (5)
A
Dynamic Host Configuration Protocol
- UDP/67, UDP/68
- Requires DCHP server, can be in router or server
- Can reserve addresses
15
Q
HTTP (2)
A
- TCP/80
- Web server communication
