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IT 254 - Illinois State University > chptr12 > Flashcards

chptr12 Flashcards

1
Q

Data

A

Messages between sender / receiver

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2
Q

Communications Channel

A

Path for messages between 2 nodes
may include intermediate nodes that forward packets
interfaces at each end may be different

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3
Q

Protocols

A

Establishes accurate and appropriate meaning to messages

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4
Q

Physical Connection

A

Independent of the messages

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5
Q

Hosts & end nodes

A

sender and receiver end points

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6
Q

Message

A

primary purpose of communication - data - program - file - multimedia - represented digitally

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7
Q

byte stream

A

term used with data as communications are predominately serial

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8
Q

Packets

A

Long messages broken down to help with channel availability
takes turns using channels
some can be identified as frame or datagram to identify purpose
Header followed by data
1A, 1B, 1C etc

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9
Q

Links

A

Segment of communication channel

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10
Q

Bandwidth

A

Bit rate of overall channel

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11
Q

Medium Guided

A

communications limited to specific path

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12
Q

Medium Unguided

A

Not limited to specific path

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13
Q

End Node Interfaces

A

Wired - Wireless Ethernet - Bluetooth - WiMax - DSL - Cable - Sat Link - Modem etc

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14
Q

Network Topology

A

Fundamental Layout of Netork
describes path between 2 points
affects availability, speed and traffic

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15
Q

Logical Topology

A

Operational relationship between the various network components

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16
Q

Physcial Topology

A

Actual layout of the network wiring

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17
Q

Mesh Topology

A

Multiple paths between end nodes
1 node failure will slow but not stop as long as other path is available
large networks that use switches & routers are typically partial mesh

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18
Q

Full Mesh Network

A

Direct Point 2 Point channel connecting every pair of nodes

impractical due to large number of connections needed

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19
Q

Bus Topology

A

Each node is tapped into the Bus along the Bus
node broadcasts a message that travels the entire bus
every node receives but ignores if not addressee
travels entire medium both directions
termination required at ends of bus to prevent echoing
branches can be added to create tree but still wide broadcast

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20
Q

Bus Network Implementation

A

req single pair of wires from one end of network to other
cheap - easy to wire
rarely used in new networks except for wireless nets

21
Q

Star Topology

A

Primarily for LANS & sometimes connecting satellite offices to central
all nodes connected to a point 2 point device
nodes communicate through central device
switching in central device connects 2 nodes together
central device can steer data from one node to another as req
most modern switches allow mult pairs simultaneously
Failure of central device will kill entire network

22
Q

Ring Topology

A

Point 2 Point connection from each node to next
Last node connects to first to create ring
nodes forward messages in loop unidirectional (bidirectional is possible tho)
past popularity ie token ring

23
Q

Local Area Networks LAN

A

Network that connects computers etc over a small localized area

24
Q

Wide Area Network WAN

A

networks over large distances

25
Q

Extranet

A

connection between a business and a business partner

26
Q

PSTN Public switched telephone networks

A

large cable companies and other common carrier providers

27
Q

Private virtual circuits

A

logical connections of the WAN as a whole

28
Q

Hub

A

is a central connection device used to simplify wiring

29
Q

hub based ethernet

A

similar to star topology but not smart - it’s passive

30
Q

service provider

A

Provides internet connection

31
Q

wi fi

A

radio based compativle extension to ethernet standard

32
Q

switched ethernet

A

based on star topology, each node connected to central switch that is capable of connecting any 2 nodes together.

33
Q

backbone networks

A

used to interconnect several LANs

34
Q

hierarchical LAN

A

higher up the backbone network

35
Q

Routers and gateways

A

intermediate link connecting nodes from various networks. Converts data format to the next required. Specialized device to interconnect networks and pass packets.

36
Q

mesh points

A

extends the range of wireless networks

37
Q

intranet

A

web services that are restricted to a group of users

38
Q

Metropolitan Area Network MAN

A

network larger in geographical scope than a LAN but within a range of less than 30 miles.

39
Q

edge & edge router

A

a router at the edge of the local network, a router would be an edge router

40
Q

point of presense

A

ISP has a point of presence in the immediate vicinity to connect to.

41
Q

Internet backbone

A

Large ISPS known as national or internation service providers to speed traffic

42
Q

Network Access Points NAPS

A

Interchanges on the internet backbone

43
Q

Piconets or Personal Area Netowrks PANS

A

separate from other networks, these are created for the presonal use of an individual with a range of 30 ft or less

44
Q

Packet Routing

A

packets are passed along the links from node to node.

45
Q

circuit switching

A

dedicates a path for exclusive use of the sender receiver pair for the entire length of time of the connection. Inefficient and rarely used

46
Q

virtual circuit

A

multi link channel path established for communication between 2 end nodes

47
Q

permanent virtual circuit PVC

A

virutal circuit that is created when a network is built

48
Q

Switched virtual circuit SVC

A

set up temporarily when a connection is esablished and maintained until the connection is closed

49
Q

packet switching

A

aka datagram switching assumes that each packet is routed from node to node independently - shortest path to destination - less traffic

IT 254 - Illinois State University (4 decks)

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