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Networking > Structured Cabling, ISO OSI > Flashcards

Structured Cabling, ISO OSI Flashcards

1
Q

Structured Cabling uses _____ to offer long term support of networks

A

High Performance Components

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2
Q

Why do we use standardized tech

A

Cause IT is always changing

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3
Q

Advantages of Structured Cabling Systems

A

Performance of LANs, Telecommunications, Data Systems will work predictably

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4
Q

Components of Structured Cabling Systems (Distributions)

A

Campus Distribution, Building Distribution, Floor Distribution, Telecommunications Outlet

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5
Q

Campus Distribution

A

Backbone cabling infrastructure connecting buildings on a large campus, typically using cables such as fiber optic or wireless

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6
Q

Building Distribution

A

Cabling infrastructure connecting campus distribution to floor distribution cabling

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7
Q

Floor Distribution

A

Cabling infrastructure that connects building distribution cabling to individual workstations or devices. Typically horizontal cabling running from IDF to telecommunications outlet.

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8
Q

Telecommunications Outlet

A

Endpoint of the structured cabling system providing connectivity to a specific device. Located in a wall or floor box. May include different jacks.

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9
Q

ISO 11801 Standard 3 Layer Model (Layers)

A

Horizontal Cabling, Building Backbone Cabling, Campus Backbone Cabling

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10
Q

Horizontal Cabling

A

Provides telecommunications services between floor distribution and Telecommunications outlet (Mostly copper cable)

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11
Q

Building Backbone Cabling

A

Provides telecommunications services between floors on a building. Connects building distribution to floor distributions

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12
Q

Campus Backbone Cabling

A

Connects building, connects two or more Building distributions (Almost always fiber optic)

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13
Q

Hardware used in cabling methods

A

Fibre Cables, Copper Cables, Wall sockets, cables, patch panels, patch cords, Standing Rack.

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14
Q

Notation for Communications Cabinet

A

“U” known as rack unit, equivalent to 445mm. 42U Rack will accept 42 one unit U patch.

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15
Q

Channel limit

A

100m for category 5,6,7 based cabling systems. Link should be limited to 90m.

Difference between the 2 allows patch cords to connect equipment at patch panel and devices from Telecommunications Outlet.

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16
Q

Communications Cabinets

A

used to house termination of backbone and horizontal cabling subsystems + electronics. Housed in Telecommunications Room.

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17
Q

Telecommunications Room

A

Void of direct sunlight, toilets, emergency escapes, areas prone to flooding, and areas containing fire extinguishers.

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18
Q

Communications Cabinets must avoid

A

force majure, unsecurity, vibration, dust, humidity

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19
Q

Communications cabinets should have

A

proper earthing, ventilation, lighting, security, fire protection, raised floors and documentation.

20
Q

Idea of common standards in layered protocols

A

To develop a core of approaches amongst all vendors and provide reasonable point of departure.

21
Q

Modern networks designer around ______. and what does it achieve?

A

layered protocols. Achieves logical decomposition, standard interfaces, and symmetry in functions.

Purpose of layered model is so layers can offer certain services to higher layers.

22
Q

ISO OSI principles:

A

Layers created when different level of abstraction is needed
Each layer has a well defined function
Function of each layer should be chosen with international standards in mind
Layer boundaries chosen to minimize info flow between layers
Enough layers so functions do not need to be thrown into one layer out of necessity.

23
Q

Line Coding

A

Process of converting digital data into a digital signal to transmit over communication channel.
Assigns a specific pattern of voltage to each bit of data, which helps receiver distinguish between bits.

24
Q

How should we encode data

A

Efficiently and error-free, with as little transactions as possible.
Manchester Coding ideal

25
Q

Subnet Layers

A

Physical, Data Link, Network

26
Q

Physical Layer

A

Responsible for transmitting raw bitstream over physical medium, and establishing connections between devices.

27
Q

Data Link Layer

A

If receiving -> Construct frame
If sending -> send frame via bitstream
Contains error handling and lets transmitter know buffer space

28
Q

Network Layer

A

Routing occurring to deliver the frame to some destination. Contains either static or dynamic routes

29
Q

Static Routes

A

Series of addresses that define a destination

30
Q

Dynamic Routes

A

Network is aware of the networks that are connected together

31
Q

Transport Layer

A

Split data from session layer up and pass it to network layer. Establish host to host connection.

32
Q

Session Layer

A

User’s interface to network. Establish connection with other machines. Manages dialogue.

33
Q

Session

A

Connection between users

34
Q

Presentation Layer

A

Functions such as Data compression, cryptography, Data diddling, salami attack (small unnoticable attacks), Piggy-backing (using users passwords), DoS.

35
Q

Data diddling

A

Modifying data prior to entry in stream

36
Q

Encryption/Decryption

A

Reversible encoding scheme based around a private key known to transmitter and receiver.
Either Transposition Cypher or Substitution Cypher

37
Q

Transposition Cypher

A

keys of letters reorganised but not necessarily disguised

38
Q

Substitution Cypher

A

Substitute one letter with another letter or group of letters

39
Q

OSI RM Security Services

A

Authentication
Access Control
Non-Repudiation
Integrity
Data confidentiality
Audit framework
Key Management

40
Q

Non Repudiation

A

Prevents users from wrongly denying a specific action.
Includes Proof of origin and Proof of delivery

41
Q

IEEE

A

Develop standards for networks. (IEEE Lan Standards Committee)

42
Q

TCP/IP Main Objective

A

Interconnect multiple networks running in heterogeneous systems

43
Q

Internet Protocol Suite

A

Part of TCP/IP. Created by DARPA

44
Q

All protocols used by TCP IP are…

A

described as a protocol suite and standardized under auspices of the ISOC

45
Q

ISOC

A

Internet Society, ISOC contains a board of trustees, along with other boards (research, engineering…)

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