Net. 1: Ch 3

Question 1

Elements of Communication

Answer 1

1. Message Source/Sender
2. Destination/Receiver
3. Channel-media
4. Message

Question 2

frame

Answer 2

format of a message sent over a network: Layer2OSI / Network Layer TCPIP

Question 3

segmenting

Answer 3

breaking down frames to meet min/max size req. over a network.

Question 4

access method

Answer 4

system to allow all systems on a network to know when to start sending message streams and how to handle errors

Question 5

flow control

Answer 5

method that regulates communications speed/timing between sender/receiver

Question 6

TCP/IP Network Physical Model

Answer 6

Application Layer: Data PDU
Transport Layer: Segment PDU:TCP
Internet Layer: Packet PDU:IP
Network Access Layer: Bits PDU

Question 7

OSI Reference Model

Answer 7

7. Application Layer: Data
8. Presentation Layer:Data
9. Session:Data
10. Transport Layer: Segment
11. Network Layer: Packet
12. Data Link Layer: Bit/Frame
13. Physical Layer: Bit

Question 8

Difference between TCP and UDP

Answer 8

Transmission Control Protocol confirms delivery User Datagram Protocol does not.

Question 9

Network Address Translation

Answer 9

NAT: Translates addresses from private network to unique global IP: Layer 3

Question 10

Address Resolution Protocol

Answer 10

provides dynamic address mapping between IP addresses and physical addresses. Layer 2.

Question 11

Internet Society

Answer 11

ISOC: prompts Internet use/development and adoption through world.

Question 12

Internet Architecture Board

Answer 12

IAB: manages/develops Internet standards:
Internet Engineering Task Force (IETF)
Internet Research Task Force: IRTF

Question 13

Institute of Electrical and Electronics Engineers

Answer 13

IEEE:standards creation board for vast majority of electrical / electronic devices

Question 14

Electronics Industries Alliance

Answer 14

EIA:trade organization for electronics industries.

Question 15

Telecommunications Industry Association

Answer 15

TIA:standards relating to radio, cell towers, satellite communication: collaborates with EIA.

Question 16

International Telecommunications Union-Telecommunications Standardization Sector

Answer 16

ITU-T: helped define Internet Television Protocol, broadband communications, country codes for phone calls.

Question 17

Internet Corporation for Assigned Names and Numbers

Answer 17

ICANN: non profit US based: coordinates IP address allocation, DNS, port numbers used in TCP/UDP

Question 18

Internet Assigned Numbers Authority

Answer 18

IANA: dept of ICANN oversees IP addresses and domain names.

Question 19

Benefits of Layer Model

Answer 19

1. assist i n protocol design
2. fosters competition
3. Layer changes dont drastically change other layers.
4. provides common language to describe network functions.

Question 20

2 Networking Models Types

Answer 20

1. Protocol: model that closely resembles structure of protocol.
2. Reference: describes what needs to be done but not how it needs to be done.

Question 21

Benefits of Message Segmentation

Answer 21

1. Different conversations can be interleaved on a network, allowing for more use simultaneously.
2. Increases reliability of network through use of multiple paths.

Question 22

multiplexing

Answer 22

process of interleaving messages on a network

Question 23

protocol data units

Answer 23

form a piece of data takes at any layer within a model.

Question 24

Data PDU

Answer 24

PDU at application layer (OSI 7-5)

Question 25

Segment PDU

Answer 25

PDU at Transport Layer (L4 OSI)

Question 26

Packet PDU

Answer 26

PDU at Internet Layer (L3 Network OSI)

Question 27

Frame PDU

Answer 27

PDU at network access layer (L2 Data Link OSI)

Question 28

Bit PDU

Answer 28

PDU used when transmitting data over a medium.

Question 29

Data Encapsulation

Answer 29

process of adding protocol headers to data. Each protocol added as its handed down the stack.

Question 30

2 Parts of Layer 3 IP Address

Answer 30

1. Network Prefix: forwards to proper network

2. Host Part: used by last router to deliver packet to destination.

Question 31

2 IP Addresses in IP Packet

Answer 31

1. Source IP

2. Destination IP

Question 32

source data link address

Answer 32

physical address of device sending packet, initialized in NIC initiating the packet.

Question 33

destination data link address

Answer 33

physical address of network interface of next hop in route or network interface of destination: contains MAC addresses

Question 34

logical address

Answer 34

another name for IP address

Question 35

physical address

Answer 35

another name for MAC address

Question 35

3 Packet Delivery Methods

Answer 35

1. unicast -single targeted
2. multicast-group targeted
3. broadcast-all