1 - The Internet Flashcards
1
Q
Need for protocol (3)
A
- Happen in an agreed order
- Travel from the sender to the correct receiver
- contain the correct, unambiguous data
2
Q
ISO/OSI Reference Model
A
- Application
- Presentation
- Session
- Transport
- Network
- Data Link
- Physical
3
Q
Physical Layer
A
- responsible for transmitting raw bit stream over the physical communication medium
- Concerned with the electrical and mechanical interface between data and physical medium
4
Q
Data Link Layer
A
- takes the bit stream from the physical layer and constructs logical chunks of data ‘frames’
5
Q
Framing
A
-> ensure the reliable transmission of info by performing limited error detection and recovery
6
Q
Network Layer
A
-responsible for providing the connection between “end systems” across a network
7
Q
NL functions (4)
A
- routing: deciding how to transmit frames between source and destination
- relaying: enables data transfer across networks
- flow control: matches traffic flow with the physical capacity of a transmission path
- sequencing: control ordering of frames across a network
8
Q
Transport Layer
A
- provides reliable end-to-end service independent of network topology
- Splits message into network size packets and joins them back together again at the other end
9
Q
Session Layer
A
- First upper layer crucial to internetworking and manages dialogue between end systems
10
Q
SL Functions
A
- est and closing of connections
- sync to allow checking and recovery of data
- negotiation of full and half duplex communication
11
Q
Presentation Layer
A
- provides a standard format for transferred information for dissimilar dat encoding
12
Q
Application Layer
A
- provides the interface between application processes e.g. file transfer, remote job execution
- provides transparency to users, load balancing machines, data bases and prospect of distributed operating systems.
