Networking

Transport

1. UDP >> UDP is a connectionless protocol
2. TCP is a connection-oriented protocol

DNS Record Types

1. SOA - Start of Authority record
   points to the primary authority for the domain we're querying
2. NS - Name Servers

• directory for devices and the IP addresses attached to them
• translate domain names into numerical IP addresses

3. A / AAAA - record that maps directly to an IP address
4. CNAME - record that acts as an alias
5. MX - Mail Exchanger - used for e-mail

Network Hardware

Router

• contains internal addresses of each device connected to router
• can join different networks, a feature switches and hubs cannot do
• performs NAT (network address translation)
• NAT allows router a single IP address
• router can direct traffic to the appropriate address

Switch

• contains the MAC (media access control) address of all - connected devices
• flood - send to ALL connected devices ”
• forward - send to a particular device
• filter - drop data entirely

Switch

• no network management ,,,
• signal splitter
• duplicates data and broadcasts it to ALL connected devices