Networking ch3

Question 1

Coax Cable

Answer 1

composed of 2 conductors an inner insulated conductor and another inner isolated conductor inside the first. the second is occasionally made of metallic foil or woven wire.

Question 2

Twisted-Pair Cable

Answer 2

individually twisted copper strands and intertwined within. the 2 categories are Shield Twisted Pair (STP) and Unshielded Twisted Pair (UTP)

Question 3

Shield Twisted Pair Cable (STP)

Answer 3

defined by the IEEE 802.ID standard, it allows a network to have redundant layer 2 connections, while logical preventing a loop, which could lead to symptoms such as a broadcast storms and MAC address table corruption

Question 4

Unshielded Twisted Pair Cable (UTP)

Answer 4

blocks EMI from the copper strands making up a twisted pair cable by twisting the strands more tightly (that is more twists per cm) by wrapping these strands around each other, the insulate each other from EMI

Question 5

Electromagnetic Interface (EMI)

Answer 5

an electromagnetic wave form that can be received by network cable (possibly corrupt data traveling on the cable) or radiate from the network cable (possibly interfering with the data traveling to another cable)

Question 6

Plenum

Answer 6

cabling that is fire retardant and minimizes toxic fumes released by network cabling if cabling were on fire. often required by local fire codes for cable In raised flooring or in an open air return duct

Question 7

Multimode Fiber (MMF)

Answer 7

has a core with a diameter large enough to permit the injection of light into the core at multiple angles. the different paths (modes) the light travels can lead to multimode delay distortion, which causes bits to be received out of order

Question 8

Single-Mode Fiber (SMF)

Answer 8

diameter is only large enough to permit a single path of light to pulse(only one mode of propagation) eliminates the concern of multimode delay distortion

Question 9

66 Block

Answer 9

traditionally cross-connects phone system cabling in corporations. also cross connect cat 3 UTP cabling. do not support LAN speed over 10-mbs

Question 10

110 Block

Answer 10

because 66 blocks are subject to too much crosstalk for higher speed LAN connections, this can be used to terminate a cable (such as a cat 5 cable) being used for those higher-speed LANs

Question 11

Hub

Answer 11

older, used to interconnect network components like clients and servers. vary in number of available ports. do not preform any inspection of traffic, simply receives traffic in a port and repeats to all other ports

Question 12

Switch

Answer 12

interconnects network components. vary in number of available ports. learns which devices reside out of which port. traffic is inspected and sent to appropriate port instead of all other ports

Question 13

Router

Answer 13

a layer 3 device. makes forwarding decisions based on logical network addresses. most modern networks use IP addressing have greater feature sets and are capable of supporting more interface types than a multilayer switch

Question 14

Multilayer Switch

Answer 14

can make traffic based decisions on layer 3 info. they more closely approach wire-speed throughput tan most routers.

Question 15

Firewall

Answer 15

network security appliance. can protect a trusted network (EX. corporate LAN) from an untrusted network (EX. the internet) by allowing the trusted network to send traffic into the untrusted network and receive the return traffic for untrusted, while blocking traffic for sessions initiated by untrusted network

Question 16

Domain Name System Server (DNS)

Answer 16

takes a domain name and resolves that name into a corresponding IP address

Question 17

Dynamic Host Configuration Protocol (DHCP)

Answer 17

dynamically assigns IP address info (EX. IP address, subnet mask, DNS servers IP address, default gateways IP address) to network devices

Question 18

Proxy Server

Answer 18

intercepts requests from client and forwards to intended destination. then it sends any return traffic back to client who initiated session. this provides address hiding for the client. some conserve WAN bandwidth by offering content catching function. some offer URL filtering (EX. block social media sites of users during work hours)

Question 19

Content Engine

Answer 19

dedicated appliance whose roll is to logically cache content received from a remote network (EX. destination on internet) subsequent requests for that content can be served logically, from the content engine, reducing bandwidth demand on a WAN

Question 20

Content Switch

Answer 20

load balance requests for content across a group of servers containing that content. if one server in a group needed maintenance preformed that server could be administratively removed from the group, maximizes up time when preforming service maintenance. minimizes load on individual serves by distributing its load across multiple identical servers. also allows a network to scale, because one or more servers could be added to the server group defined on the content switch, if the load on existing serves increases

Question 21

Virtual Server

Answer 21

allows a single physical server to host multiple virtual instances of various operating systems. EX. a single physical server could host multiple Microsoft windows servers and multiple Linux servers

Question 22

Virtual Switch

Answer 22

preforms layer 2 functions (EX. VLAN separation and filtering) between various server instances running on a single physical server

Question 23

Virtual Desktop

Answer 23

allows a user to store data in a centralized data center, as opposed to a hard drive or local computer. with appropriate authentication a user can access the data from various remote devices. (EX. smart phone, other computer)

Question 24

On-Site

Answer 24

In the context of virtualization technologies refers to hosting virtual devices on hardware physically located in a corporate data canter

Question 25

Off-Site

Answer 25

in the context of virtualization technologies refers to hosting virtual devices on hardware physically located in a service providers data center

Question 26

Network as a Service (NaaS)

Answer 26

a service provider offering were clients can purchase data services (EX. email, LDAP and DNS services) traditionally hosted in a corporate data canter

Question 27

Virtual PBX

Answer 27

usually a VoIP telephony solution hosted by a service provider, which interconnects with the company’s existing telephone system

Question 28

Session Initiation Protocol (SIP)

Answer 28

a VoIP protocol used to set up, maintain and tear down VoIP phone calls

Question 29

Real-Time Transport Protocol (RTP)

Answer 29

a layer 4 protocol that carries voice (and interactive video)