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Q:

Which of the following is part of the IEEE 802.3u standard?

A) 100Base2 B) 10Base5
C) 100Base-TX D) 1000Base-T
 
Answer & Explanation Answer: C) 100Base-TX

Explanation:

IEEE 802.3u is Fast Ethernet at 100Mbps and covers 100Base-TX, 100BaseT4, and 100Base-FX.

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Q:

Which part of a MAC address is called the organizationally unique identifier(OUI)?

A) The first 24 bits, or 3 bytes B) The first 12 bits, or 3 bytes
C) The first 24 bits, or 6 bytes D) The first 32 bits, or 3 bytes
 
Answer & Explanation Answer: A) The first 24 bits, or 3 bytes

Explanation:

The first 24 bits, or 3 bytes, of a MAC address is called the organizationally unique identifier (OUI).

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Q:

Which of the following connection mechanism is used by Ethernet?

A) Token passing B) CSMA/CD
C) CSMA/CA D) Host polling
 
Answer & Explanation Answer: B) CSMA/CD

Explanation:

Ethernet networking uses Carrier Sense Multiple Access with Collision Detection (CSMA/CD), a protocol that helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium.

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Q:

Differentiate a MAC address and an IP address and describe how and when each address type is used in a network?

Answer

A MAC address is a hexadecimal number identifying the physical connection of a host. MAC addresses are said to operate on layer 2 of the OSI model. IP addresses, which can be expressed in binary or decimal format, are logical identifiers that are said to be on layer 3 of the OSI model. Hosts on the same physical segment locate one another with MAC addresses, while IP addresses are used when they reside on different LAN segments or subnets. Even when the hosts are in different subnets , a destination IP address will be converted to a MAC address when the packet reaches the destination network via routing.

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Q:

What is the bit length and expression form of a MAC address?

Answer

48 bits (6 bytes) expressed as a hexadecimal number.

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Subject: CCNA

Q:

Which layer ensures the trustworthly transmission of data across a physical link and is primarily concerned with physical addressing, line discipline, network topology, error notification, ordered delivery of frames, and flow control?

Answer

PDUs at the data link layer are called frames and provide physical addressing, plus other options to place packets on the network medium.

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Q:

Which layer chooses and determines the availability of communicating partners along with the resources necessary to make the connection, coordinates partnering applications, and forms a consensus on procedures for controlling data integrity and error recovery?

Answer

The application layer is responsible for finding the network resources broadcast from a server and adding flow control and error control (if the application developer chooses)

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Q:

Which layer defines how data is formatted , presented, encoded, and converted for use on the network?

Answer

The presentation layer makes sure that data is in a readable format for the Application layer.

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Subject: CCNA