WGU C172 Network and Security -
Foundations
protocol Ans- The set of rules established for users to exchange information
topology Ans- The network architecture used to interconnect the networking equipment
deterministic network Ans- Each station connected to the network is ensured access for tr...
WGU C172 Network and Security -
Foundations
protocol Ans- The set of rules established for users to exchange information
topology Ans- The network architecture used to interconnect the networking equipment
deterministic network Ans- Each station connected to the network is ensured access for transmission of
its messages at regular or fixed time intervals
bus topology Ans- The computers share the media (coaxial cable) for data transmission
ThinNet Ans- The coaxial cable used in a bus network.
star topology Ans- Twisted-pair cables connect the devices to a central hub or switch
hub Ans- A multiport repeater device used at the center of a star topology
multiport repeater Ans- The data it receives is broadcast and seen by all devices connected to its ports.
A hub.
broadcast Ans- Transmission of data by a hub to all devices connected to its ports
switch Ans- Device used at the center of a star topology that forwards a frame it receives directly out the
port associated with its destination address
mesh topology Ans- All networking devices are directly connected to each other, allows for full
redundancy
OSI model Ans- The seven layers describing network functions
,Physical layer Ans- Provides the electrical and mechanical connection to the network (cabling, NICs). 1st
OSI layer
Data link layer Ans- Handles error recovery, flow control (synchronization), and sequencing (MAC,
Ethernet). 2nd OSI layer
Network layer Ans- Accepts outgoing messages and combines messages or segments into packets,
adding a header that includes routing information (IP, IPX). 3rd OSI layer
Transport layer Ans- Concerned with message integrity between source and destination (TCP, UDP). 4th
OSI layer
Session layer Ans- Provides the control functions necessary to establish, manage, and terminate the
connections (NSF, SQL). 5th OSI layer
Presentation layer Ans- Accepts and structures the messages for the application (ASCII, JPEG). 6th OSI
layer
Application layer Ans- Interacts with application programs that incorporate a communication
component such as your Internet browser and email (HTTP, FTP, SMTP). 7th OSI layer
3 basic steps to isolate network problem Ans- Is the connection to the machine down? (layer 1)
Is the network down? (layer 3)
Is a service on a specific machine down? (layer 7)
CSMA/CD Ans- The Ethernet LAN media-access method, carrier sense multiple access with collision
detection
Ethernet Ans- LAN protocol created in 1972 and standardized in 1980 using CSMA/CD.
Frame Ans- Contains the header, data, and trailer (the padding and 4-byte CRC frame check sequence)
, Frame header Ans- Consists of the preamble, start frame delimiter, destination and source addresses,
and length/type field
64 bytes Ans- Minimum length of an Ethernet frame
1518 bytes Ans- Maximum length of an Ethernet frame
MAC address Ans- A unique 6-byte/48-bit address assigned by the vendor of the network interface card
displayed in 12 hex digits
Organizationally unique identifier (OUI) Ans- The first 3 bytes of the MAC address that identifies the
manufacturer of the network hardware
ipconfig /all Ans- Enables the MAC address information to be displayed from the command prompt
IANA Ans- The agency that assigns IP addresses to computer networks
IP address Ans- Unique 32-bit address that identifies on which network the computer is located as well
as differentiates the computer from all other devices on the same network
Class A networks Ans- Governments, very large networks. Range from 0.0.0.0 to 126.255.255.255.
Example: 44.x.x.x
Class B networks Ans- Midsize companies, universities, and so on. Range from 128.0.0.0 to
191.255.255.255. Example: 128.123.x.x
Class C networks Ans- Small networks. Range from 192.0.0.0 to 223.255.255.255 Example: 192.168.1.x
Class D networks Ans- Reserved for multicast groups. Range from 224.0.0.0 to 239.255.255.255.
Example: 224.x.x.x
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