Structured Cabling, ISO OSI

Question 1

Structured Cabling uses _____ to offer long term support of networks

Answer 1

High Performance Components

Question 2

Why do we use standardized tech

Answer 2

Cause IT is always changing

Question 3

Advantages of Structured Cabling Systems

Answer 3

Performance of LANs, Telecommunications, Data Systems will work predictably

Question 4

Components of Structured Cabling Systems (Distributions)

Answer 4

Campus Distribution, Building Distribution, Floor Distribution, Telecommunications Outlet

Question 5

Campus Distribution

Answer 5

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

Question 6

Building Distribution

Answer 6

Cabling infrastructure connecting campus distribution to floor distribution cabling

Question 7

Floor Distribution

Answer 7

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

Question 8

Telecommunications Outlet

Answer 8

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

Question 9

ISO 11801 Standard 3 Layer Model (Layers)

Answer 9

Horizontal Cabling, Building Backbone Cabling, Campus Backbone Cabling

Question 10

Horizontal Cabling

Answer 10

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

Question 11

Building Backbone Cabling

Answer 11

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

Question 12

Campus Backbone Cabling

Answer 12

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

Question 13

Hardware used in cabling methods

Answer 13

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

Question 14

Notation for Communications Cabinet

Answer 14

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

Question 15

Channel limit

Answer 15

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.

Question 16

Communications Cabinets

Answer 16

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

Question 17

Telecommunications Room

Answer 17

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

Question 18

Communications Cabinets must avoid

Answer 18

force majure, unsecurity, vibration, dust, humidity

Question 19

Communications cabinets should have

Answer 19

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

Question 20

Idea of common standards in layered protocols

Answer 20

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

Question 21

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

Answer 21

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.

Question 22

ISO OSI principles:

Answer 22

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.

Question 23

Line Coding

Answer 23

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.

Question 24

How should we encode data

Answer 24

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

Question 25

Subnet Layers

Answer 25

Physical, Data Link, Network

Question 26

Physical Layer

Answer 26

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

Question 27

Data Link Layer

Answer 27

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

Question 28

Network Layer

Answer 28

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

Question 29

Static Routes

Answer 29

Series of addresses that define a destination

Question 30

Dynamic Routes

Answer 30

Network is aware of the networks that are connected together

Question 31

Transport Layer

Answer 31

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

Question 32

Session Layer

Answer 32

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

Question 33

Session

Answer 33

Connection between users

Question 34

Presentation Layer

Answer 34

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

Question 35

Data diddling

Answer 35

Modifying data prior to entry in stream

Question 36

Encryption/Decryption

Answer 36

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

Question 37

Transposition Cypher

Answer 37

keys of letters reorganised but not necessarily disguised

Question 38

Substitution Cypher

Answer 38

Substitute one letter with another letter or group of letters

Question 39

OSI RM Security Services

Answer 39

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

Question 40

Non Repudiation

Answer 40

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

Question 41

IEEE

Answer 41

Develop standards for networks. (IEEE Lan Standards Committee)

Question 42

TCP/IP Main Objective

Answer 42

Interconnect multiple networks running in heterogeneous systems

Question 43

Internet Protocol Suite

Answer 43

Part of TCP/IP. Created by DARPA

Question 44

All protocols used by TCP IP are...

Answer 44

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

Question 45

ISOC

Answer 45

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