Domain 4 - Communication and Network Security Flashcards
Baseband
One channel
Can send one signal at a time
100baseT
Broadband
Multiple channels, multiple signals at a time
Cable TV
Circuit Switching
Original voice networks
Dedicated circuit/channel between two nodes
Can provide dedicated bandwidth on p2p connections (T1)
Once channel is connected, it is dedicated to that purpose even while no data is transferred
Packet Switching
ARPAnet
Routing - packet can take many paths, etc
Unused bandwidth can be used for other things
Class A Networks
0.0.0.0 - 127.255.255.255
Class B Networks
128.0.0.0 - 191.255.255.255
Class C Networks
192.0.0.0 - 223.255.255.255
Class D Networks (multicast)
224.0.0.0 - 239.255.255.255
Class E Networks (RESERVED)
240.0.0.0 - 255.255.255.255
X.25 (protocol)
Packet-switched WAN protocol
Provides error correction that can add latency on long links
Can carry TCP/IP, but no point since TCP provided its own reliability
Frame Relay
Packet-switched layer 2 WAN protocol
No error recovery
Focuses on speed
Carries higher layer protocols (TCP/IP) to provide reliability
Multiplexes multiple logical connections over a single physical to create Virtual Circuits
Local addresses are called DLCI’s
ATM (protocol)
Asynchronous Transfer Mode
- WAN technology using fixed-length cells
- Cells are 53 bytes long
- 5 byte header
- 48 byte data
Reliable throughput compared to ethernet, because all cells are always 53 bytes
PPP
Point-to-Point protocol
- Layer 2
- Replacement for SLIP
- Based on HDLC
SLIP
Serial Line Internet Protocol
- Layer 2, asynchronous
- No CIA
PPTP
Point-to-Point Tunneling Protocol
- Tunnels PPP via IP
- Uses GRE (TCP 1723)
