Vocab

Question 1

A network topology and associated communication protocols that allow an organizations computers to send/receive data.

Answer 1

Computer network

Question 2

Represents the wires or wireless links that connect computers together for the purpose of data communication

Answer 2

Network topology

Question 3

Name the network topologys

Answer 3

Star
Bud
Ring
Mesh 
Tree
P2P

Question 4

What is the equation used to create a full connected network?

Answer 4

(N * (N-1))/ 2

Question 5

Represents the rules that permit two computers to transmit digital data

Answer 5

Communication protocol

Question 6

What are the communication protocols used?

Answer 6

Ethernet, IPv4, IPv6, TCP, UDP, HTTP

Question 7

Represents the an undesirable situation where an increase in data within a computer network causes a decrease in the throughput across the computer network

Answer 7

Network congestion

Question 8

Represents the number of packets successfully delivered by all computers attached to a computer network

Answer 8

Throughput

Question 9

Represents the an undesirable situation where an increase in data within the computer network causes a decrease in throughput across the computer network

Answer 9

Network congestion

Question 10

What are the causes of network congestion?

Answer 10

1. Too many frame retransmissions due to collisions and / or corruption
2. Too many hosts placed in a collision domain
3. Too many hosts placed in a broadcast domain
4. Broadcast storms
5. Too much multicast traffic
6. Low bandwidth network links
7. Using HUBs with the network

Question 11

Represents the set of all computing devices attached to a network segment that are allowed to “hear” all the packet broadcasts sent out on that specific network segment

Answer 11

Broadcast domain

Question 12

What can computers that reside in the same broadcast domain do?

Answer 12

Can communicate with each other via a data link layer broadcast frame

Question 13

Any network segment that is used by two or more computers to transmit data

Answer 13

Collision domain

Question 14

With respect to collision domains , when a device is using the network segment , another device must:

Answer 14

wait to transmit

Question 15

With respect to collision domains , when a device is using the network segment , another device must wait to transmit

Answer 15

Network contention

Question 16

A network of networks

Answer 16

Internetwork

Question 17

An internetwork is created when two or more unique networks are:

Answer 17

• connected together by a common router

- configured to use a logical addressing scheme with a protocol, such as IPv4 or IPv6

Question 18

Cisco network devices are comprised of:

Answer 18

Routers, switches, bridges, and/or hubs

Question 19

Layer 3 device or network layer device - “Speak” a network layer protocol
*IPv4, etc.

Pass packets between networks

Answer 19

Cisco router

Question 20

A network segment represent _________ and ________

Answer 20

1 broadcast domain

1 collision domain

Question 21

Layer 2 device or Data Link Layer device -“Speak ” a data link layer protocol *Ethernet, etc.

A single interface represents one (1) unique collision domain

A frame sent by one device is delivered to the device attached and that has the destination MAC address

Answer 21

Cisco switch

Question 22

Layer 2 device or Data Link Layer device - General “speak” two layer 2 protocols

Function is similar to switches

Historically , two interfaces

• One interface speaks one DLL protocol
• The other speaks another DLL protocol
• E.g X.25 - Ethernet bridge

Answer 22

Cisco bridge

Question 23

Layer 1 device or Physical Layer device

A frame sent by one device is copied and sent to all other attached devices

are essentially Repeaters

interfaces reside within the same collision domain

is essentially a bus network topology

Answer 23

Cisco hub

Question 24

What are the goals of internetworking

Answer 24

To create efficient internetworks that allow users to communicate and share services and resources

Minimize network contention

Question 25

Rules & misc. thoughts

Answer 25

- Avoid using bridges and hub - Use routers to create more broadcast domains - Use switches to create more collision domains

Question 26

A router with 4 active interfaces will create how many broadcast domains?

Answer 26

4 broadcast domains

Question 27

A switch with 25 active interfaces will create how many collision domains?

Answer 27

25 collision domains

Question 28

simply a model of "how” communication should take place between two or more computing devices

Answer 28

Reference model

Question 29

Reference models often define several service layers. What are some facts about the layers?

Answer 29

- Each service layer provides unique functions - Layering provide abstraction !!! * We can replace one layer with a new layer as long as the new layer provides the same unique functions

Question 30

There are two comm reference models. What are they?

Answer 30

1. Transmission Control Protocol/Internet Protocol (TCP/IP) | 2. Open System Interconnect (OSI)

Question 31

The _____ model is not a layered architecture because no implementation of the model exists

Answer 31

OSI

Question 32

What are the seven layers of the OSI reference model?

Answer 32

``` Application (top) Presentation Session Transport Network Data-link Physical (bottom) ```

Question 33

This Layer is responsible for pushing / pulling bits to / from adjacent node

Answer 33

Physical

Question 34

Physical layer the PDU is a:

Answer 34

Bit

Question 35

Data link is responsible for:

Answer 35

- Uniquely identifying each piece of network hardware via a Medium Access Control (MAC) address (A.K.A Hardware Address ) - Controlling when a station places bits on the transmission media - Detecting Frame errors

Question 36

Data link layer the PDU is a:

Answer 36

Frame

Question 37

Network layer the PDU is a:

Answer 37

Packet

Question 38

Network layer is responsible for:

Answer 38

-Uniquely identifying each network attached device via a network address (IP address ) – Determining where a Packet should go next (i.e. Routing )

Question 39

Transport layer the PDU is a:

Answer 39

Segment if TCP is used | Datagram if UDP is used

Question 40

Transport layer is responsible for:

Answer 40

- Providing connection-oriented end-to-end communication from the user's perspective. - Providing connectionless communication from the user's perspective

Question 41

Session layer the PDU is a:

Answer 41

Message

Question 42

Session layer is responsible for:

Answer 42

- Establishing, maintaining, and releasing a connection between two hosts. - Two types of communication sessions * Connection Oriented communication *Connectionless communication

Question 43

communication is similar to a telephone call - You “set-up” a communication path between two computers before the transmission of data occurs - Each Transport Layer segment traverses the same communication path from source to destination - The communication path is " broken ” when one of the computers is finished communicating

Answer 43

Connection-oriented communication

Question 44

Communication is to sending mail via the postal system. - Each Transport Layer segment can traverse a separate path from source to destination . * A segment may not arrive in the order in which it was sent.

Answer 44

Connectionless

Question 45

Presentation layer the PDU is a:

Answer 45

Message

Question 46

Presentation layer is responsible for:

Answer 46

- Defining how the data is presented to the user or application so that it is recognizable using the specific hardware - Data encryption

Question 47

The presentation layer received the message from this layer. It can/may be modified and sent to the session layer. What layer sent it?

Answer 47

Application layer

Question 48

TCP/IP reference model layers

Answer 48

Application Transport Internet Host-to-network

Question 49

The process/application layer provides:

Answer 49

Similar service of application, presentation, and session layers from OSI model

Question 50

Host-to-host layer is essentially the OSI ________ layer

Answer 50

Transport

Question 51

Hybrid reference model used for the semester with 5 layers:

Answer 51

``` Application Transport Network Data link Physical ```