Day One 1.1

Question 1

What is the total size of an Ethernet header?

Answer 1

14 bytes

Question 2

What information does the Source MAC address in an Ethernet header provide?

Answer 2

The origin of the frame’s data

Question 3

What is the purpose of the Preamble in an Ethernet frame?

Answer 3

notify the receiving device that a frame is about to be sent and to synchronize the receiver’s clock with the sender’s clock.

Question 4

Internet Protocol (IP) header

Question 5

Three things reside at the physical layer of the OSI model?

Answer 5

Repeater, hub, network cabling

Question 6

Physical layer of the OSI model is also known as:

Answer 6

Layer 1

Question 7

What are the characteristic components of the OSI data link layer?

Answer 7

MAC address, network switch, ethernet frame

Question 8

Layer 2 of the OSI model is also referred to as:

Answer 8

Data link layer

Question 9

Name 4 OSI network layer components

Answer 9

Routing: Determines the best path for data to travel from the source to the destination.
Logical Addressing: Uses IP addresses to identify devices on the network.
Packet Forwarding: Moves packets from one network segment to another.
Fragmentation and Reassembly: Breaks down large packets into smaller ones for transmission and reassembles them at the destination.

Question 10

Refers to a data link layer device designed to forward frames between network segments?

Answer 10

Switch

Question 11

What is the name of a network layer protocol that specifies the format of packets and addressing scheme in network communications?

Answer 11

IP

Question 12

Which OSI layer assumes the responsibility for opening, closing, and maintaining connections between applications?

Answer 12

session

Question 13

Authentication and authorization take place at the:

Answer 13

session layer

Question 14

Layer 5 of the OSI model is also referred to as:

Answer 14

Session

Question 15

what three things takes place at the presentation layer of the OSI model

Answer 15

Data format translation,
data compression,
data encryption/decryption.

Question 16

Which of the following protocols reside(s) at the application layer of the OSI model?
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Answer 16

Variety of protocols that facilitate communication and data transfer between networked applications. HTTP, HTTPS, FTP, SMTP, IMAP POP3, DNS, Telnet, SSH, SNMP, LDAP

Question 17

In the OSI model, the physical layer PDU is known as:

Answer 17

bit

Question 18

In the OSI model, the layer 2 PDU is called:

Answer 18

Frame

Question 19

Which of the following answers refer to the OSI layer 2 header data?

Answer 19

Source MAC address
Destination MAC address

Question 20

In the OSI model, the layer 3 PDU is known as

Answer 20

packet

Question 21

Here are some key components typically found in a Network layer header:

Answer 21

Source IP address, Destination IP address, Protocol, TTL, Checksum, ID, flags and fragment offset.

Question 22

User Datagram Protocol (UDP) is a connection-oriented protocol using a three-way handshake which is a set of initial steps required for establishing network connection. UDP supports retransmission of lost packets, flow control (managing the amount of data that is being sent), and sequencing (rearranging packets that arrived out of order). Example applications of UDP include transmission of text and image data.

Answer 22

false

Question 23

Transmission Control Protocol (TCP) is an example of a connectionless protocol. Because TCP does not support three-way handshake while establishing a network connection, it is referred to as unreliable or best-effort protocol. Example applications of TCP include transmission of video and audio streaming data.

Answer 23

false

Question 24

In the OSI model, the layer 4 TCP PDU is known as:

Answer 24

Datagram

Question 25

Which of the following answers does not refer to the OSI TCP segment header

Answer 25

Layer 3 header