Bits & Bytes: Week 5, III-IV - WAN and Wireless Networks Flashcards
This acts like a single network but spans across multiple physical locations
WAN
ACRONYM:
WAN
Wide Area Network
This is the place where an ISP bridges the gaps by connecting parts of a network that spans a large physical area
Demarcation Point
What are two connections used to make local loops?
T-carrier lines and high speed optical connections
This is the area between the demarcation point and the ISP’s core network
a Local Loop
Where in the network model does WAN work using the layer’s protocols to transport data?
Data Link Layer
ACRONYM:
HDLC
High-Level Data Link Control
ACRONYM:
ATM (as used in computer networking)
Asynchronous Transfer Mode
This type of technology establishes a VPN tunnel between two sites.
Point to Point VPN
What is another term for Point to Point VPN?
Site to Site VPN
This set of specifications defines WiFi
IEEE 802.11 Specifications
This is a certain section of the radio spectrum that’s been agreed upon to be used a specific type of communication
Frequency band
What is the frequency band for FM radio?
88 to 108 megahertz
What are 5 common 802.11 specifications listed in the order they were adopted?
802.11b, 802.11a, 802.11g, 802.11n, and 802.11ac
What are the 2 most common WiFi frequency bands?
2.4 gigaherts and 5 gigahertz
What are two reasons for releasing a new version of the 802.11 specifications?
Higher access speeds or the ability for more devices to simultaneously used a network
802.11 protocols define how wireless networks operate are which two layers of the networking model?
the Physical and Data Link layers
This part of an 802.11 frame is 16 bits long and contains a number of subfields that are used to describe how the frame itself should be processed
frame control field
ACRONYM:
WAP
Wireless Access Point
A device that bridges the wireless and wired portions of a network
Wireless Access point
What are three things that determine which wireless access point a device associates with?
Physical proximity, general signal strength, and wireless interference
In an 802.11 frame, there are __ ________ _______ which provide enough room to indicate which Wireless Access Point should be processing the frame
4 address fields
In an 802.11 frame, what the first address field? What is is contained in this address field?
The source address is the MAC number of the sending device
In an 802.11 frame, what the second address field? What is is contained in this address field?
The intended destination address is the MAC address of the device intended to receive the frame
In an 802.11 frame, what the third address field? What is is contained in this address field?
The receiver address is the MAC address of the WAP intended to receive the frame
In an 802.11 frame, what the fourth address field? What is is contained in this address field?
The transmitter address is the MAC address of whatever device just transmitted the frame
In an 802.11 frame, what field is between the third and fourth address fields? What is is contained in this field?
The sequence control field contains a sequence number used to keep track of the ordering of frames
In an 802.11 frame, what field contains all of the data of the protocols further up the stack?
the Data Payload Field
In an 802.11 frame, what is the last field of the frame called? What does it contain?
the Frame check sequence field, contains a checksum used for a cyclical redundancy check
Networks that operate on the __Ghz band are almost always faster but have less range.
5Ghz band
Networks that operate on the __Ghz band are almost always faster but have less range.
2.4Ghz band
