Quiz 1

Question 1

WAN

Answer 1

Wide Area Networks

Question 2

LAN

Answer 2

Local Area Networks

Question 3

MAN

Answer 3

Metropolitan Area Networks

Question 3

Communication

Answer 3

the process by which people share ideas, experiences, knowledge and feelings through the transmission of symbiotic messages

Question 4

Communications model vocab: Source

Answer 4

Generates data to be transmitted

Question 5

Communications model vocab: Transmitter

Answer 5

Converts data into transmittable signals

Question 6

Communications model vocab: Transmission Medium

Answer 6

Carries data

Question 7

Communications model vocab: Receiver

Answer 7

Converts received signal into data

Question 8

Communications model vocab: Destination or Sink

Answer 8

Take incoming data

Question 9

Examples of wired transmission mediums

Answer 9

Fiber optic, coaxial cable, unshield twisted pair (UTP)

Question 10

What is the usual wireless transmission medium?

Answer 10

Electromagnetic energy

Question 11

PAN

Answer 11

Personal Area Network

Question 12

Wide Area Networks usually…

Answer 12

• Span a large geographical area
• Cross public rights of way
• Rely in part on common carrier circuits
• Alternative technologies used include:
  ─ Circuit switching Packet switching
  ─ Frame relay
  ─ Asynchronous Transfer Mode (ATM)

Question 13

Circuit Switching Switching

Answer 13

─ Uses a dedicated communications path established for duration of conversation
─ Comprising a sequence of physical links
─ Dedicated logical channel
─ e.g. Telephone network

Question 14

Packet Switching

Answer 14

─ Data sent out of sequence
─ Small chunks (packets) of data at a time
─ Packets passed from node to node between source and destination
─ Used for terminal to computer and computer to computer communications

Question 15

Frame Relay

Answer 15

─ Packet switching systems have large overheads to compensate for errors
─ Modern systems are more reliable
─ Errors can be caught in end system
─ Provides higher speeds with most error control overhead removed

Question 16

Asynchronous Transfer Mode (ATM)

Answer 16

─ Evolution of frame relay
─ Fixed packet (cell) length with little overhead for error control
─ Anything from 10Mbps to Gbps
─ Constant data rate using packet switching technique with multiple virtual circuits

Question 17

Local Area Networks

Answer 17

─ Smaller scope (building or small campus)
─ Usually owned by same organization as attached devices
─ Data rates much higher

Question 18

Metropolitan Area Networks

Answer 18

─ Middle ground between LAN and WAN
─ Private or public network
─ High speed
─ Large area

Question 19

ARPANET

Answer 19

─ What the internet evolved from
─ First operational packet network
─ Applied to tactical radio & satellite networks
─ Had a need for interoperability
─ Led to standardized TCP/IP protocols

Question 20

The internet

Answer 20

─ Hosts: interconnected end systems including PCs, workstations, servers, phones, tablets,
etc.
─ Network: most hosts that use the Internet are connected to a network, such as a local area
network (LAN) or a wide area network (WAN)
─ Routers: Those networks are, in turn, connected by routers

Question 21

Modulation

Answer 21

Representing data with something (ex. Amplitude) (get a new definition)

Question 22

Guided Transmission Medium

Answer 22

Transmission capacity depends on distance and on weather medium is poin-to-point

Examples: Twisted pair (TP), coaxial cable, optical fiber

Question 23

Unguided Transmission medium

Answer 23

Example: Wireless

Question 24

Direct Link

Answer 24

No intermediate devices

Question 25

Multi-point

Answer 25

More than two devices share a link

Question 26

Simplex

Answer 26

One direction transmission

Question 27

Half duplex

Answer 27

Either direction supported, but only one direction at a time

Question 28

Full duplex

Answer 28

Both directions support at same time

Question 29

Sine wave

Answer 29

Rate of change: Hz per second, Period = T, T = 1/F Phase: Relative to positive in time

Question 30

Electromagnetic spectrum

Answer 30

Wireless mics: 470 - 698 MHz FM Radio: 88 - 108 MHz Sirius xx Satellite Radio: 2332.5 MHz - 2345 MHz

Question 31

Protocol Architecture is needed because…

Answer 31

-Using a common protocols for different tasks makes common rules and conventions.

Question 32

Protocol Architecture Main Features

Answer 32

-Syntax: Format of data blocks -Semantics: Control info for coordination and error handling -Timing: Speed match and sequencing -Breaks down complex tasks into subtasks. Each of these subtasks are implemented separately as layers. -Vertical stack.

Question 33

Layers Of Protocol Architecture

Answer 33

-Each layer performs a related subset of functions required to communicate with (an)other system(s). -Higher layers depend on lower levels for primitive functions and to conceal details of those functions. (Lower layers are expected to provide services to higher levels) -When a change is made to one layer then there should be no changes to another layer.

Question 34

TCP/IP Protocol Architecture

Answer 34

-Developed by DARPA for ARPANET -5 Layers: (5) Application Layer, (4) Transport Layer, (3) Internet Layer, (2) Link Layer, (1) Physical Layer

Question 35

TCP/IP: Physical Layer

Answer 35

-Communication theory: Phy layer sends individual bits from one node to a directly connected node -Contains physical interface between the data transmission device and the transmission medium -Examples: Ethernet uses guided wired medium, LAN uses electromagnetic waves

Question 36

TCP/IP: Link Layer

Answer 36

-Exchanges data between two or more directly connected devices (examples: PCs, routers, etc) -Packets in linked layer = frames -Uses MAC addresses for multiple access -Examples: Point-to-point Protocol (PPP), Ethernet: IEEE 802.3, Wireless LAN: IEEE 802.11 (a/b/g/n/ac)

Question 37

TCP/IP: Internet Layer

Answer 37

-Responsible for moving network layer packets from one host to another host -Internet Layer Packets = datagrams -IP Protocol: Defines the format of datagrams and how end systems and routers act on the datagram -Routing Protocol: Determine routes that datagrams take between sources and destinations -This layer routes datagrams through a series of packet switches called routers between the source and destination

Question 38

TCP/IP: Transport Layer

Question 39

TCP/IP: Application Layer