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The original commercial version of Ethernet supported 10 Mbps bandwidth; the version
introduced in the early 1990s supports 100 Mbps; and in 1998, Gigabit Ethernet was
introduced. All versions use the same data frame formats, with the same maximum
PDU sizes, so they can interoperate freely. Given this information and what you know of
layered technologies, which of the following statements is true? (Choose all that apply.)
a. Ethernet works at the Data Link and Physical layers of the OSI model, and upgrades
to newer, faster versions of Ethernet can be made by changing only the components
that work at these layers.
b. Ethernet spans several layers and requires a new protocol stack to upgrade to new
versions.
c. Changes in technology at one layer of the OSI model don't usually affect the operation
of other layers.
d. Ethernet isn't considered a scalable technology.

a. Ethernet works at the Data Link and Physical layers of the OSI model, and upgrades
to newer, faster versions of Ethernet can be made by changing only the components
that work at these layers.
c. Changes in technology at one layer of the OSI model don't usually affect the operation
of other layers.

The addition of information to a PDU as it's passed from one layer to the next is called
which of the following?
a. PDI transforming
b. Encapsulation
c. Deencapsulation
d. Converting

b. Encapsulation

Layers acting as though they communicate directly with each other across the network
are called which of the following?
a. Partners
b. Synchronous
c. Interchangeable
d. Peers

d. Peers

Place the following letters in the correct order to represent the OSI model from Layer 7
to Layer 1:
a. Presentation
b. Data Link
c. Session
d. Physical
e. Application
f. Transport
g. Network

e. Application
a. Presentation
c. Session
f. Transport
g. Network
b. Data Link
d. Physical

Which OSI layer creates and processes frames?

Data Link Layer

Which OSI layer handles flow control, data segmentation, and reliability?
a. Application
b. Physical
c. Transport
d. Data Link

c. Transport

Which OSI layer determines the route a packet takes from sender to receiver?
a. 7
b. 1
c. 3
d. 4

C. 3

Which layer of the OSI model does Project 802 divide into two sublayers?
a. Physical
b. Data Link
c. Network
d. Session

b. Data Link

What are the names of the sublayers specified as part of Project 802? (Choose all that
apply.)
a. Data Link Control (DLC)
b. Logical Link Control (LLC)
c. Carrier Sense Multiple Access/Collision Detection (CSMA/CD)
d. Media Access Control (MAC)

b. Logical Link Control (LLC)
d. Media Access Control (MAC)

Which IEEE 802 standard applies to Ethernet?
a. 802.2
b. 802.3
c. 802.4
d. 802.5
e. 802.11

b. 802.3

What is the name of the PDU at the Transport layer?
a. Bit
b. Packet
c. Segment
d. Data

c. Segment

At which OSI layer does the PDU contain sequence and acknowledgement numbers?
a. Application
b. 4
c. Data Link
d. 6

b. 4

Which of the following is an example of software found at the Application layer?
(Choose all that apply.)
a. FTP
b. TCP
c. HTTP
d. ICMP

a. FTP
c. HTTP

At which Data Link sublayer does the physical address reside?
a. Media Access Control (MAC)
b. Logical Link Control (LLC)
c. Data Access Control (DAC)
d. Network Access Control (NAC)

a. Media Access Control (MAC)

Which of the following problems can occur at the Physical layer?
a. NIC driver problems
b. Incorrect IP addresses
c. Signal errors caused by noise
d. Incorrect segment size

c. Signal errors caused by noise

A computer won't connect to the network. After some investigation, you
find that the patch cable isn't terminated correctly.

Physical

A computer can access resources on the local LAN but not on a different
subnet. You find that the computer's default gateway isn't configured
correctly.

Network

You can ping a computer you're trying to transfer files to via FTP, but you
can't communicate by using FTP.

Application

All computers connected to a particular hub have lost network connectivity.
You determine that the hub is the problem

Physical

You receive an encrypted text file, but when you open it, the text is unreadable.
You determine that decryption didn't take place as it should have

Presentation

You check some statistics generated by a network-monitoring program and
discover that an abnormally high number of CRC errors were detected.

Data Link

One of your servers has been exhibiting sluggish network performance.
You use a network-monitoring program to try to evaluate the problem.
You find considerable TCP retries occurring because the server is being
overwhelmed by data, and packets are being discarded.

Transport

A user is trying to connect to another computer, but the logon attempt is
continually rejected.

Session

You try to access a Linux server to share files by using NFS. You can
communicate with the server, but the shared files don't appear to be
available.

Application

You inspect a computer that isn't able to communicate with other computers.
You find that IPv6 instead of IPv4 is installed on that computer.

Network

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