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COMP3010 - Advanced Networks > Abbreviations > Flashcards

Abbreviations Flashcards

1
Q

AUP

A

Acceptable Use Policy of a network

eg JANET AUP for academic hotspots

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2
Q

JANET

A

private gov funded org providing network services to uk research and HE institutions

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3
Q

WLAN

A

Wireless Local Area Network

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4
Q

MAC address

A

Media Access Control address

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5
Q

NIC

A

Network Interface Controller (network card)

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6
Q

EHA

A

Ethernet Hardware Address

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7
Q

DHCP

A

Dynamic Host Configuration Protocol

Application layer

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8
Q

DNS

A

Domain Name System

Application layer

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9
Q

FTP

A

File Transfer Protocol

Application layer

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10
Q

HTTP

A

HyperText Transfer Protocol

Application layer

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11
Q

IMAP

A

Internet Message Access Protocol
email retrieval and storage
(Application layer)
Mainly for retrieving from server to user

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12
Q

POP

A

Post Office Protocol
(Application layer)
Mainly for retrieving from server to user

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13
Q

SMTP

A

Simple Mail Transfer Protocol
(Application layer)
Mainly for sending from user to server for relaying

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14
Q

SOCKS

A

Socket Secure
Routes network packets btwn client & server through a proxy server
Although application layer, in OSI model, at Layer 5, session layer

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15
Q

OSI Model

A 
Open Systems Interconnection Model
Layers
1. Physical Layer (802.11, bltth)
2. Data Link Layer (btwn nodes)
3. Network Layer (IPv4/6)
4. Transport Layer (TCP, UDP)
5. Session Layer (PPTP, SOCKS)
6. Presentation Layer (MIME, XDR)
7. Application Layer (DNS, FTP, SMTP, Telnet, DHCP)
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16
Q

TCP/IP Model

A 
Internet Protocol Suite
Transmission Control P./Internet P.
1. Link (Frame data - MAC)
2. Internet (IP data)
3. Transport (TCP/UDP data)
4. Application (DHCP DNS HTTP etc data)
17
Q

UDP

A

User Datagram Protocol
messages (datagrams) sent by computer applications to other hosts on an IP network without prior communications to set up special transmission channels or data paths
connectionless

18
Q

UDP use

A

where error checking/correction not needed or performed by application
dropping packets over delayed packets
1. transaction oriented - simple query-response protocol suited
2. simple, suitable for bootstrapping
3. stateless - suitable for large numbers of clients - streaming media
4. lack of retransmission delays makes it suitable for real time applications - VOIP, online games
5. good for unidirectional communication, such as broadcast info, like service discovery

19
Q

TCP

A

Transmission Control Protocol
connection oriented protocol
requires handshaking to set up end to end comms
once set up, user data can be sent bi-directionally

20
Q

TCP characteristics

A
  1. Reliable - manages msg ack, retransmission & timeout. Multiple attempts to dlvr
    If lost on way, server re-requests lost part. There is no missing data
  2. Ordered - two messages sent, 1st will arrive 1st; if arrive in worng order, TCP buffers till in right order
  3. Heavyweight - requires three packets to set up a socket connection b4 any data is sent. Handles reliability & congestion control
  4. Streaming - data is read as a byte stream, no distinguishing indications are transmitted to signal message (segment) boundaries
21
Q

SSH

A

Secure Shell - Cryptographic network protocol for secure data communication, remote command line login, remote command exe and other secure network services between two networked computers.
Secure channel, SSH server and SSH client

22
Q

SSID

A

Service Set Identification
802.11 network
Service set - all devices associated with a WLAN
SS can be local, independent, extended or mesh
Basic service set - access point + station
Mesh stations only participate in mesh functionalities, mesh formation, path selection and forwarding
Independent BSS - ad hoc network of client devices without a controlling AP

23
Q

SSID hiding or network cloaking

A

some access points allow a user to inhibit the broadcasting of their SSIDs
station can only join a BSS after the associated SSID has been specified explicitly
Deters casual wireless snooping

24
Q

WEP

A

Wired Equivalent Privacy
1997
40 or 104-bit key & 24-bit initialisation vector
lots of free software to break it like - aircrack
mitigated a little by using dynamic WEP

25
Q

RADIUS

A

Remote Authentication Dial In User Service - a network authentication protocol

26
Q

RADIUS realm

A

usually defined by a domain name - soton.ac.uk
identifies users by their local identifier like ord1c08
can pass a client request to a server in another RADIUS realm
response from home realm allows user to access network when away

27
Q

LDAP

A

Lightweight Directory Access Protocol

28
Q

Active Directory

A

MS authentication for windows domain networks, makes use of LDAP etc

COMP3010 - Advanced Networks (19 decks)

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