Chapter 1-5

Question 0

Removal of headers by the receiving computer before sending it to the next higher layer.

Answer 0

De-Encapsulation.

Question 1

Process of putting headers and sometimes trailers around data.

Answer 1

Encapsulation

Question 2

The HTTP protocol belongs to what TCP-IP layer?

Answer 2

Application.

Question 3

TCP and UDP belong to what layer?

Answer 3

Transport.

Question 4

5 layers of the TCP-IP network model?

Answer 4

Physical
Data Link
Network
Transport
Physical

Question 5

How does the TCP-IP model layers differ from the OSI model?

Answer 5

The physical layer is broken down into
Session
Presentation
Application

Question 6

The encapsulated data in the transport layer?

Answer 6

Segment.

Question 7

The encapsulated data in the Network layer?

Answer 7

Packet.

Question 8

The encapsulated data in the Data-Link layer?

Answer 8

Frame.

Question 9

100 Base-T can support what speeds and it maximum length?

Answer 9

100 Mbps 100 meters.

Question 10

100 Base-T is also referred to as what?

Answer 10

Fast Ethernet.

Question 11

1000 Base-LX can support what speeds and its maximum length?

Answer 11

1000 Mbps 5000 meters.

Question 12

OSI term to generally refer to a group of info by a particular layer.

Answer 12

PDU (Protocol Data Unit)

Question 13

What is full duplex better than half duplex?

Answer 13

Send and receive at the same time.

Question 14

In straight through cabling, on devices that support full duplex, what pins do they transmit and receive through?

Answer 14

The first device transmits - 1 and 2
Receive - 3 and 6
The second device receives - 1 and 2
Transmits - 3 and 6

Question 15

What is the draw back to half duplex?

Answer 15

Can only send OR receive. Not at the same time.

Question 16

1000Base-LX is also referred to as what?

Answer 16

Gigabit Ethernet even though it’s actually fiber.

Question 17

Ethernet and PPP belong to what TCP-IP layer?

Answer 17

Link (layer 2)

Question 18

The process of a lower layer doing a task for a higher layer on the same device?

Answer 18

Adjacent layer interaction.

Question 19

Which OSI layer defines the functions of logical network-wide addressing and routing?

Answer 19

Layer 3 network.

Question 20

Which OSI layer defines standards for cabling and connectors?

Answer 20

Layer 1 physical.

Question 21

What is true about the CSMA/CD algorithm?

Answer 21

Collisions can happen but the algorithm defines how the computers should notice a collision and how to recover.

Question 22

What is true about the Ethernet FCS field?

Answer 22

It resides in the Ethernet trailer

Question 23

What are two terms that describe Ethernet addresses that can be used to send one frame to multiple devices on a LAN?

Answer 23

Broadcast address

Multicast address

Question 24

Which of the following typically connects to a four wire line by the telco?

Answer 24

CSU/DSU

Question 25

2 important facts about IPv4 groups IP addresses.

Answer 25

All IP addresses in the same group must not be separated by a router. All IP addresses separated by a router must be un different groups.

Question 26

Goals of IP routing protocols?

Answer 26

1. To dynamically learn and fill the routing table with a route for each subnet. 2. If more than one route to subnet is available, to place the best route in the routing table. 3. To notice when routes in the table are no longer valid, and remove them. 4. If a route is removed and another route through another router is available, save it. 5. Low convergence time. (the time between losing a route and finding another) 6. to prevent routing loops.

Question 27

Class A addresses can have how many networks and how many hosts per network?

Answer 27

About 126 networks and 16,777,214 hosts per network.

Question 28

What is a classful IP network?

Answer 28

Class A B or C

Question 29

What 4 steps does a router use to forward data?

Answer 29

1. use data link FCS to ensure the frame had no errors. 2. Deencapsulate old data link header and trailer. 3. Compare the destination IP address to the routing table and find the best route.(identifies the outgoing interface and possibly the next hop router IP address) 4. Encapsulate the packet inside a new datalink header and trailer appropriate for the outgoing interface and forward the frame.

Question 30

How do Ip standards subdivide addresses into classes?

Answer 30

By the value of the first octet.

Question 31

Class A IP addresses start with what range of DDN numbers?

Answer 31

1-126 (About half the address space)

Question 32

Class B addresses can have how many networks and how many hosts per network?

Answer 32

About 16,384 networks and 65,534 hosts.

Question 33

Class B IP addresses start with what range of DDN numbers?

Answer 33

128-191 (About 1/4)

Question 34

When a host sends a packet to another host on a different subnet what does it do?

Answer 34

Forwards it to the default gateway (default router)

Question 35

Class C addresses can have how many networks and how hosts per network?

Answer 35

About 2,097,152 networks and 254 hosts.

Question 36

Class C IP addresses start with what range of DDN numbers?

Answer 36

192-223 (About 1/8)

Question 37

3 features of protocols in layer 4.

Answer 37

Error recovery Flow control Segmenting of application data

Question 38

Which header fields identify which TCP/IP applications gets data received by a computer?

Answer 38

TCP port number | UDP port number

Question 39

Flow control, error recovery, multiplexing using port numbers and ordered data transfer are typical functions of which layer 4 protocol?

Answer 39

TCP

Question 40

TCP and UDP share what same function?

Answer 40

Multiplexing using port numbers.