Networking

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Chapter 2 Questions and Answers
Daisy Ordonez
Flashcards by Daisy Ordonez, updated more than 1 year ago
Daisy Ordonez
Created by Daisy Ordonez about 8 years ago
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Question Answer
When was the first major standard describing a structured cabling system released? 1995
What does EIA and TIA stand for? EIA stands for Electronic Industries Alliance TIA stands for Telecommunications Industry Assoication
What are the three parts of the EIT/TIA 568-B standard? EIA/TIA-568-B.1: Commercial Cabling Standard, Master Document EIA/TIA-568-B.2: Twisted Pair Media EIA/TIA-568-B.3: Optical Fiber Cabling Standard
Identify the six subsystems of a structured cabling system? 1. Building Entrance 2. Equipment Room (ER) 3. Telecommunications Closet 4. Backbone Cabling 5. Horizontal Cabling 6. Work Area
What is cross-connect? A space where you are going to take one or multiple cables and connect them to one or more cables or equipment
What is main cross-connect? (MC) Usually connects two or more buildings and is typically the central telecommunications connection point for a campus or building.
The Telco and the ISP usually connects to what room in the campus network hierarchy? (ER) Equipment Room
What is the WO, and what is its purpose? Workstation or Work Area Outlet (WO) also called teh TO (telecommunications outlet) is used to connect devices to the cable plant.
The patch cable from a computer typically terminates into which of the following? Jack in the wall plate
What is the over all length limitation of an individual cable run from the telecommunications closet to a networking device in the work area? 100 meter
A general rule of thumb is to allow how many meters for the cable run from the telecommunications closet to the work area? 90 meters
What is the difference in CAT 5 and CAT 5e? CAT5e cable is an enhanced version of CAT5 and provides improved performance requirements of the cable.
What is the data rate for Ethernet? 10 Mbps
What is the data rate for FastEthernet? 100 Mbps
What improvements will CAT6 and CAT7 cable provide? CAT6 standard supports 10 gigabit data rates up to 100 meters and CAT7 will also supports 10 Gbps up to 100 meters with improved bandwidth
What is the benefit of using shielded twisted-pair cabling? An addition of a shield reduces the potential for electromagnetic interference
Which cable UTP or STP is preferred by the industry? UTP
What are the color maps and pin # associated for T568A and T568B? T568A 1 white green 2 green 3 white orange 4 blue 5 white ble 6 orange 7 white brown 8 brown T568B 1 white orange 2 orange 3 white green 4 blue 5 white blue 6 green 7 white brown 8 brown
What is the difference between T568A and T568B? They are just two different manufacturer standards used to wire the modular connection hardware. There is not a performance improvement just a color order choice
How many wires pairs are in a CAT6 twisted-pair cable? four
What does an X on the input to a hub represet? Cross-connected input
Define the term cross-connected input? This means that transmit and receive pairs are internally swapped to maintain proper signal alignment of the TX and RX pairs.
Define the term NEXT and what it measures Near end crosstalk A measure of the level of crosstalk or signal coupling within the cable, with a high NEXT (dB) value being desirable
Define power sum measurements? The enhanced twisted-pair cable must meet four-pair NEXT requirements, called PSNEXT testing. power sum testing measures the total crosstalk of all cable pairs.
Define propagation delay? The measure of the amount of time it takes for a signal to propagate from one end of the cable to the other.
Signals travel in a cable at some percentage of the velocity of light. The term of this is? NVP Nominal velocity of propagation
Why is delay skew critical? The measure of the difference in arrival time between the fastest and the slowest signal in a UTP wire pair.
Why are power-sum measurements critical for high speed data communication over UTP The gigabit data rate capability of twisted pair requires the use of all four wire pairs in the cable with each pair handling 250 mbps of data.
What is the limit on the bend radius for a UTP cable, and why is this important?
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