The Bits and Bytes of Computer
Networking Questions and Answers
Already Passed
What are the 5 Networking Layers in order? ✔✔5. Application layer
4. Transport layer
3. Network layer
2. data link layer
1. Physical layer
Physical Layer ✔✔This layer has devices that interconnect computers with cabling connectors. It
sends and receives signals on the physical wire or antenna to transmit the bits found in frames.
Data Link layer ✔✔Responsible for defining a common way of interpreting signals, so network
deices can communicate.
Network Layer ✔✔Allows different networks to communicate with each other through
networks, such as the internet.
,Transport Layer ✔✔This layer sorts out which client and server programs are supposed to get
that data.
Application Layer ✔✔Software that we use, the part of the model that is closest to the user
(gmail, browser, etc.). Permits applications to request access to the network services.
Layer 1
Cable, Ethernet, hubs ✔✔Physical Layer
Layer 2
Switch, Ethernet Protocol ✔✔Data Link layer
Layer 3
Internet Protocol, Router, Logical Addressing ✔✔Network Layer
Layer 4
Transport Control Protocol, Client Server, Server, User Datagram Protocol ✔✔Transport Layer
,Layer 5
Web Browser, HTTP , SMTP - send receive email ✔✔Application Layer
UDP or User Datagram Protocol ✔✔This is an alternative communications protocol to
Transmission Control Protocol. It is part of the transport layer protocol. UDP is connectionless.
This means there is no setup or teardown of a connection.
What is the difference between UDP & TCP? ✔✔The UDP protocol works similarly to TCP, but
it throws out all the error-checking stuff. All the back-and-forth communication introduces
latency, slowing things down. TCP provides mechanisms to ensure that data is reliably delivered
while UDP does not.
Crosstalk ✔✔Caused by the electrical signals of one wire disrupting the signals of another wire.
TCP or Transmission Control Protocol ✔✔A protocol developed for the internet to get data from
one network device to another
IP or Internet Protocol ✔✔A set of rules governing the format of data sent over the internet or
other network.
, Cat 5 ✔✔Type of cable that has the ability to transfer information from one computer to another
Cat 5e ✔✔Enhanced cat 5 cable used for gigabit speeds and minimum for Voice over IP
Cat 6e ✔✔This cable has shorter distance at higher speeds.
Fiber cable ✔✔Contain individual optical fibers that uses light to transmit data.
Which cable supports the longest distance to transmit data - Cat5, Fiber Optic, Cat5e, Cat6e?
✔✔Fiber Optic
Hub ✔✔This is a physical layer device used to connect network components. All the devices
connected to a hub will end up talking to all other devices at the same time.
Switch ✔✔A Data Link Layer device that connects network segments. A switch can inspect the
contents of the Ethernet protocol data being sent around the network, determine which system
the data is intended for and then only send data to that one system.
Networking Questions and Answers
Already Passed
What are the 5 Networking Layers in order? ✔✔5. Application layer
4. Transport layer
3. Network layer
2. data link layer
1. Physical layer
Physical Layer ✔✔This layer has devices that interconnect computers with cabling connectors. It
sends and receives signals on the physical wire or antenna to transmit the bits found in frames.
Data Link layer ✔✔Responsible for defining a common way of interpreting signals, so network
deices can communicate.
Network Layer ✔✔Allows different networks to communicate with each other through
networks, such as the internet.
,Transport Layer ✔✔This layer sorts out which client and server programs are supposed to get
that data.
Application Layer ✔✔Software that we use, the part of the model that is closest to the user
(gmail, browser, etc.). Permits applications to request access to the network services.
Layer 1
Cable, Ethernet, hubs ✔✔Physical Layer
Layer 2
Switch, Ethernet Protocol ✔✔Data Link layer
Layer 3
Internet Protocol, Router, Logical Addressing ✔✔Network Layer
Layer 4
Transport Control Protocol, Client Server, Server, User Datagram Protocol ✔✔Transport Layer
,Layer 5
Web Browser, HTTP , SMTP - send receive email ✔✔Application Layer
UDP or User Datagram Protocol ✔✔This is an alternative communications protocol to
Transmission Control Protocol. It is part of the transport layer protocol. UDP is connectionless.
This means there is no setup or teardown of a connection.
What is the difference between UDP & TCP? ✔✔The UDP protocol works similarly to TCP, but
it throws out all the error-checking stuff. All the back-and-forth communication introduces
latency, slowing things down. TCP provides mechanisms to ensure that data is reliably delivered
while UDP does not.
Crosstalk ✔✔Caused by the electrical signals of one wire disrupting the signals of another wire.
TCP or Transmission Control Protocol ✔✔A protocol developed for the internet to get data from
one network device to another
IP or Internet Protocol ✔✔A set of rules governing the format of data sent over the internet or
other network.
, Cat 5 ✔✔Type of cable that has the ability to transfer information from one computer to another
Cat 5e ✔✔Enhanced cat 5 cable used for gigabit speeds and minimum for Voice over IP
Cat 6e ✔✔This cable has shorter distance at higher speeds.
Fiber cable ✔✔Contain individual optical fibers that uses light to transmit data.
Which cable supports the longest distance to transmit data - Cat5, Fiber Optic, Cat5e, Cat6e?
✔✔Fiber Optic
Hub ✔✔This is a physical layer device used to connect network components. All the devices
connected to a hub will end up talking to all other devices at the same time.
Switch ✔✔A Data Link Layer device that connects network segments. A switch can inspect the
contents of the Ethernet protocol data being sent around the network, determine which system
the data is intended for and then only send data to that one system.
