Chapter 10 Computer Networking Part 2

Part 2

Network Ports

guide traffic to the correct final destination

Network port numbers contain

16-bit binary numbers or 65,536 possible values (0-65,535)

Ports 0-1,023 are known as

Well-known ports

Ports 1,024-49,151 are known as

Registered ports

Ports 49,152-65,535 are known as

Dynamic ports

Port 21

File Transfer Protocol (FTP)

Port 22

Secure Shell (SSH)

Port 3389

Remote Desktop Protocol (RDP)

Ports 137, 138, 139

NetBios

Port 53

Domain Name Service (DNS)

Port 25

SMTP

Port 110

Post Office Protocol (POP)

Port 143

Internet Message Access Protocol (IMAP)

Port 80

HTTP

Port 443

HTTPS

Service Set Identifier (SSIDs)

identify wireless networks

You can disable SSID Broadcasting

True

Pre-shared keys restrict

wifi access

Captive Portals

intercept web requests to require Wi-Fi login. They provide authentication on unencrypted wireless networks.

WEP (Wired Equivalent Privacy)

is considered insecure

Wifi Protected Access

is considered insecure

WPA2

add security with CCMP and is secure

WPA3

adds Simultaneous Authentication of Equals (SAE) and is secure

Ping Command

checks whether a remote system is responding

Troubleshooting with Ping

1. Ping the remote system

2. Ping another system on the internet

3. Ping a system on your local network

4. Try the same process with a different computer

hping command

creates customized ping requests

Traceroute command

determines the network path between two systems

Tracer route is abbreviated to what on windows

tracert

pathping

windows command that combines ping and tracert functionality