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Networking > Norman notes Until Structured Cabling > Flashcards

Norman notes Until Structured Cabling Flashcards

1
Q

Computer Networks

A

the interconnection of a collection of autonomous computers

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2
Q

Advantages of Computer Networks

A

Resource Enhancement (Sharing)
High speed communications
Cost Balancing (scalable and agile)
Reliable
Availability
Mobility (accessed from anywhere)

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3
Q

Simple network model

A

Logical connection between two APS comes about by a physical connection of circuits

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4
Q

Protocols

A

A set of rules that govern the communication between two entities

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5
Q

Categories of protocols

A

Proprietary
Public
De Jure Standards
De Facto standards

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6
Q

Proprietary Protocols

A

Device can only communicate with devices of the same protocol

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7
Q

Public protocol

A

Standardized publicly used protocol such as tcpip

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8
Q

Defacto standards protocols

A

Standard protocol that comes around due to widespread acceptance

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9
Q

De jure standards

A

Formal standards by organizations such as IEEE. Ensure QoS

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10
Q

Types of Protocol

A

Master and slave
Peer to peer
Connection less data gram
Connection oriented virtual circuit
Send and pray
Remote procedural call
Synchronous
Asynchronous
Layered
Monolithic
Heavy
Light

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11
Q

Master and Slave

A

One device known as master controls all other slave devices

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12
Q

Connectionless data gram

A

Data is transmitted without establishing dedicated connection. Each packet treated individually, no guarantee they will arrive in order

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13
Q

Connection oriented (VC)

A

Dedicated connection, packets arrive in order

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14
Q

Send and pray

A

Transmit data without any error checking

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15
Q

Remote procedural call (rpc)

A

Program on one pc allowed to execute on another pc over a network

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16
Q

Synchronous

A

Sender and receiver operate in lockstep

17
Q

Asynchronous

A

Data transmitted independently

18
Q

Layered

A

System broken down into separate layers that interact through interface

19
Q

Monolithic

A

Single tightly coupled unit with no separation between modules

20
Q

Heavy

A

Needs a lot of overhead to function

21
Q

Light

A

Simple and efficient, less overhead required

22
Q

What is the function of a protocol

A

It’s the way two ends of the service exchange data. Uses communication systems to define what each user sees.

Uses classes of service

23
Q

Classes of service

A

Connection oriented
Connection less service
Acknowledged connectionless
Unconfirmed connection oriented (send and pray)

24
Q

Responsibilities of protocols

A

Data formatting (prepare data)
Address resolution (map address to physical location)
Synchronization (between sender and receiver)
Error detection and correction
Flow control
Routing (select best path)
Segmentation and reconstruction
Congestion control
Access control
Link management
Quality of service

25
Q

Classifications of networks

A

WAN / ex the internet
MAN / ex network of schools in city
LAN / ex office network

26
Q

Propagation delay

A

Metric used to test packet transmission time over network.

<1 is LAN
~1 is MAN
>1 is WAN

27
Q

Wan Channel

A

Supports complete packets so END. nodes never know the state of the network

28
Q

Lan channel

A

Only supports small fraction of packets so nodes know state of channel

29
Q

When connecting lan to wan backbone

A

Make sure not to alter perception of network for nodes

30
Q

WANs must:

A

Be designed and supported as backbone infrastructure
Supply communication links with higher throughput and lower latency channels
Provide wider range of services in an integrated manner without degradation of service

31
Q

What are MANs

A

they are wans with lan technology.
Supported by optic tech such as fiber optics

32
Q

Internetworking

A

Concerned with connection of local mans and wans to produce highly connected mans and wans

33
Q

Internetworking elements and why they are needed

A

Repeaters, routers, gateways

Needed to produce cost effective solutions that overcome physical restrictions

34
Q

Network topologies

A

Physical topology is the actual layout of the network,
logical topology is how the data flows through

35
Q

Considerations when designing network topologies

A

Max reliability
Route traffic along least cost path
Give end user highest response time and throughput
High availability

36
Q

All physical topologies are variants of

A

Point to point and multipoint methods

37
Q

Multipoint

A

Multiple devices connected through single communications medium

38
Q

Physical topologies

A

Hierarchical
Bus
Ring
Star
Mesh

Networking (7 decks)

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