Network+ Chapter 2

Question 1

____________is a conceptual blueprint of how communications should take place. Ch 2 pg 28

Answer 1

reference model

Question 2

How many layers are their to the OSI model and name each layer in order? Ch 2 Pg 30

Answer 2

Application (Layer 7)
Presentation (Layer 6)
Session (Layer 5)
Transport (Layer 4)
Network (Layer 3)
Data Link (Layer 2)
Physical (Layer 1)

Question 3

How do some people remember the the OSI Model? Ch 2 Pg 30

Answer 3

Please 
Do 
Not 
Throw
Sausage
Pizza 
Away 
(To remember the seven layers (starting at Layer 1 and moving up to Layer 7).

Question 4

Within the OSI model at which layer does File,Print,message,database, and application services reside? Cg 2 pg 30

Answer 4

Application Layer

Question 5

Within the OSI model at which layer does Data Encryption, Compression and translation services reside? Cg 2 pg 30

Answer 5

Presentation

Question 6

Within the OSI model at which layer does the End to End connection services reside? Cg 2 pg 30

Answer 6

Transport

Question 7

Within the OSI model at which layer does Framing reside? Cg 2 pg 30

Answer 7

Data Link

Question 8

How does the Presentation layer get its name? Ch 2 pg 33

Answer 8

It presents data to the Application layer and is responsible for data translation and code formatting.

Question 9

What is the Session Layer responsible for? Ch 2 pg 33

Answer 9

is responsible for setting up, managing, and then tearing down sessions between Presentation layer entities.

Question 10

__________is responsible for setting up, managing, and then tearing down sessions between Presentation layer entities. Ch 2 pg 33

Answer 10

Session Layer

Question 11

The session layer coordinates communication between systems and serves to organize their communication
by offering these three different modes: Ch 2 pg 33

Answer 11

simplex, half duplex, and full duplex

Question 12

The term__________ can be used at the Transport layer. Ch 2 pg 33

Answer 12

reliable networking-(It means that acknowledgments, sequencing, and flow control will be used.)

Question 13

define the the three-way handshake? pg 34

Answer 13

1)The first “connection agreement” segment is a request for synchronization.
2)The next segments acknowledge the request and establish connection parameters—the
rules—between hosts. These segments request that the receiver’s sequencing is synchronized
here as well so that a bidirectional connection is formed.
3)The final segment is also an acknowledgment. It notifies the destination host that the
connection agreement has been accepted and that the connection has been established.
Data transfer can now begin.

Question 14

Data integrity is ensured at the ____________ by maintaining____________and by allowing users to request reliable data transport between systems. Ch 2-pg 35

Answer 14

Transport layer

Flow control

Question 15

A virtual circuit is set up (such as a three-way handshake).

Answer 15

1) It uses sequencing.
2) It uses acknowledgments.
3) It uses flow control.

Question 16

a technique that requires a receiving machine to communicate with the transmitting source by sending an acknowledgment message back to the sender when it
receives data. Ch 2-pg 38

Answer 16

positive acknowledgment with retransmission

Question 17

These are used to transport user data through the internetwork. Ch 2-pg 40

Answer 17

Data packets

Question 18

Two examples of routed protocols are? Ch 2-pg 40

Answer 18

IP and IPv6

Question 19

These are used to update neighboring routers about the networks connected to all routers within the internetwork
Ch 2-pg 40

Answer 19

Route-update packets

Question 20

What are 3 common routing protocols?

Ch 2-pg 40

Answer 20

Routing Information Protocol (RIP),
RIPv2, Enhanced Interior Gateway Routing Protocol (EIGRP)
Open Shortest Path First (OSPF).

Question 21

Route-update packets are used for what? ch 2 pg 40

Answer 21

help build and maintain routing tables on each router.

Question 22

Here are some points about routers that you should definitely commit to memory: ch 2 pg 41

Answer 22

1) Routers, by default, won’t forward any broadcast or multicast packets.
2) Routers use the logical address in a Network layer header to determine the next-hop
router to forward the packet to.
3) Routers can use access lists, created by an administrator, to control security on the types of packets that are allowed to enter or exit an interface.
4) Routers can provide Layer 2 bridging functions if needed and can simultaneously route
through the same interface.
5) Layer 3 devices (routers, in this case) provide connections between virtual LANs (VLANs).
6) Routers can provide quality of service (QoS) for specific types of network traffic.

Question 23

true of false Routers can also be referred to as a Layer 4 switch. ch 2 pg 41

Answer 23

False- a layer 3 switch is referred to a router.

Question 24

This Layer in the OSI Model provides the physical transmission of the data and handles error notification, network topology, and flow control. ch 2 pg 41

Answer 24

Data Link layer

Question 25

The Data Link layer formats the message into pieces, each called a _________, and adds a customized header containing the destination and source hardware address.

ch 2 pg 41

Answer 25

data frame

Question 26

The IEEE Ethernet Data Link layer has two sublayers:

ch 2 pg 43

Answer 26

Media Access Control (MAC)

Logical Link Control (LLC)