Annex C05 Communicating Over the Network

Question 0

Local Area Network (LAN)

Answer 0

Any network linking two or more computer and related devices within a limited geo area

Under control of a common administration

A network serving a home, building, or campus is considered a LAN

Characterized by high speed (bandwidth) and minimum delay

Question 1

Intermediary Devices

Answer 1

Provides connectivity and ensures data flows across the network

May provide security (CIA)

Regenerate signals

Maintains pathway info

QoS

Question 2

Wide Area Network (WAN)

Answer 2

Interconnects two high speed LANs over a geo distance

Usually slower than a LAN

Usually different transmission path than a LAN

Question 3

Protocol

Answer 3

Set of predetermined rules for a particular type of comm

Term used to refer to software that implements a protocol

Question 4

Protocol Suite

Answer 4

Set of rules that work together to facilitate comm

A standard is a process or protocol suite that has been endorsed by the networking industry to ratify standards organization

Question 5

Standard

Open vs Closed

Answer 5

Protocol in data world that has been endorsed by the networking industry and ratified by a standards organization

Open: vendor independent (IP, TCP, FTP, HTTP, XMPP, HTML, XML)

Closed: vendor specific (Apple talk, quick time, ms exchange, novell, groupwise)

Question 6

OSI Layers

Answer 6

Provide consistency within all types of network protocols and services

Divides comm protocols into 7 layers (application, presentation, session, transport, network, datalink, physical)

Describes how different protocols work together and interact with each other

Question 7

Protocol Data Unit (PDU)

Answer 7

How we identify data at different layers of the OSI model

Question 8

Encapsulation

Answer 8

Technique used by layered protocols in which a layer adds header info to the PDU from the layer above

Question 9

Transport Control Protocol/Internet Protocol (TCP/IP)

Answer 9

More closely matches the actual structure of a particular protocol suite

Question 10

Application (Layer 7)

Answer 10

Interfaces to the user that enables programs to use network services

Question 11

Presentation (Layer 6)

Answer 11

Formats

Question 12

Session (Layer 5)

Answer 12

Establishing and maintaining comm between nodes on the network

Question 13

Transport (Layer 4)

Answer 13

Responsible for ensuring data is transferred reliably, in correct sequence, and without errors. Transport layer protocols break large data units received from the session layer into smaller pieces called segments, this process is known as segmentation

Question 14

Network (Layer 3)

Answer 14

Network layer protocols accept Transport layer segments and adds logical addressing info in the network header, this info is called a packet. This layer handles the routing of packets

Question 15

Data Link (Layer 2)

Answer 15

Adds host based delivery info to the packet, creating frames. Once this happens, they can be transmitted by the physical layer

Subdivided into Logical Link Control (LLC) and Media Access Control (MAC)

Question 16

Physical (Layer 1)

Answer 16

Protocols will accept frames from the Data Link Layer and generate voltage, radio waves, or pulses of light to transmit signals