The Bits and Bytes of Computer Networking
What's a router? a) A physical layer device that allows connections for many computers at once b) A device that knows how to forward data between independent networks c) A more advanced version of a switch d) A physical layer device that prevents crosstalk
b) A router connects independent networks by forwarding data between them
Most devices are purely a server or a client. a) True b) False
b) False
Which of these is a server? a) A device operating on the data link layer that connects many devices together and inspects ethernet protocol data b) Something providing data to something requesting the data c) A device that forwards data between multiple networks d) Something receiving data from something providing data
b) Something providing data to something requesting data is operating as a server
What is the difference between full duplex and half duplex? a) Half duplex occurs when hubs are in use; full duplex occurs when switches are in use b) Full duplex is a form of simplex communications c) Full duplex allows communications in two directions at the same time; half duplex means that only one side can communicate at a time d) Full duplex is slower than half duplex
c) A half duplex connection allows communication in both directions, but only one side can communicate at a time
What is used to determine when the communications channels are clear and when a device is free to transmit data? a) Internet Protocol (IP) b) Ethernet c) Carrier Sense Multiple Access with Collision Detection (CSMA/CD) d) Transmission Control Protocol (TCP)
c) Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
What kind of wiring is in cables that communicate in voltage changes that are received by the receiving device as ones and zeros? a) Gold b) Aluminum c) Copper d) Fiber
c) Copper wires are used in cables to communicate in voltage changes to a receiving device
Which layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model is responsible for defining a common way to interpret signals so network devices can communicate? a) Network b) Transport c) Data link d) Application
c) Data link
A Local Area Network (LAN) uses Category 6 cabling. An issue with a connection results in a network link degradation and only one device can communicate at a time, but information can still go in either direction. What is the connection operating at? a) Full Duplex b) Simplex c) Half Duplex d) Partial
c) Half Duplex
Which of the following is an example of a network layer (layer 3) protocol in the five-layer TCP/IP model? a) TCP b) Ethernet c) IP d) UDP
c) IP, or Internet Protocol, is the most common network layer protocol
What modulation type is used for computer networks? a) Simplex communication b) RJ45 c) Line coding d) Line crimping
c) Line coding is the modulation of an electrical charge so that each side of a connection knows what is a one and what is a zero
Which of the following is the first layer of the TCP/IP Five-layer network model. a) Data link b) Transport c) Physical d) Network
c) Physical
Which of the following is a device that knows how to forward traffic between independent networks? a) Client b) Hub c) Router d) Switch
c) Router
What address is used for Ethernet broadcasts? a) 11:11:11:11:11:11 b) 00:00:00:00:00:00 c) FF:FF:FF:FF:FF:FF d) FF:FF:FF:FF:FF:00
c) The address FF:FF:FF:FF:FF:FF is used for Ethernet broadcast traffic
On which layer are Ethernet standards and some wireless technologies operating? a) The physical layer b) The transport layer c) The data link layer d) The network layer
c) The data link layer introduces the first protocols including Ethernet standards and some wireless protocols
Which layer of the five layer TCP/IP model deals with cabling and connectors? a) The transport layer b) The application layer c) The physical layer d) The network layer
c) The physical layer deals with physical devices like cables and connectors
What does LAN stand for? a) Large area network b) Locally available network c) Little area network d) Local area network
d) A LAN is a Local Area Network
How many octets are there in a MAC address? a) 8 b) 4 c) 5 d) 6
d) A MAC address is a 48-bit number consisting of 6 octets
Which of these is an example of something that works on the application layer (layer 5 of the five-layer TCP/IP model)? a) UDP b) A router c) An ethernet cable d) A browser
d) A browser is an application that lets users visit websites. Since it is an application, it is on the Application layer
What is a cyclical redundancy check? a) A way for two computers to synchronize their clocks b) The actual data being transported by an Ethernet frame c) A technique that allows for multiple logical LANs to operate on the same equipment d) A mathematical calculation used to ensure that all data arrived intact
d) A mathematical calculation used to ensure that all data arrived intact - A cyclical redundancy check ensures that there was no data corruption
Which of these allows connections from many devices and inspects the contents of ethernet protocol data? a) A hub b) A cable c) A collision domain d) A switch
d) A switch can connect many devices and inspect the contents of ethernet protocol data
Multiple systems try to send data at the same time. The electrical pulses sent across the cable interfere with each other. What type of network segment is being used? a) Local Area Network (LAN) b) Wide Area Network (WAN) c) Subnet d) Collision domain
d) Collision domain
Which level of the TCP/IP five-layer model does a router operate on? a) The data link layer b) The transport layer c) The application layer d) The network layer
d) The network layer moves data across a group of networks
Which of the following are category types of Twisted Pair Ethernet cable? (Select all that apply) a) Shielded Twisted Pair (STP) b) Unshielded Twisted Pair (UTP) c) USB Cable d) Foiled Twisted Pair (FTP)
a) Shielded Twisted Pair (STP) - An STP cable uses a braided aluminum and/or copper shielding to encase the four twisted pairs underneath the outer jacket b) Unshielded Twisted Pair (UTP) - The most common and least expensive type of Ethernet cable found in business and home networks d) Foiled Twisted Pair (FTP) - An FTP cable uses a thin foil shield that wraps around the bundle of twisted pair wires underneath the outer jacket
The ____________ consists of devices and is responsible for sending signals between devices. a) physical layer b) network layer c) data link layer d) modulation
a) The physical layer is the first layer of the TCP/IP Five-Layer Network Model and represents the physical devices that interconnect computers
Fiber cables use pulses of light to represent the ones and zeros of data. a) True b) False
a) True
The TCP provides mechanisms to ensure that data is reliably delivered. a) True b) False
a) True
What is the most common type of cabling used for connecting computing devices? a) Twisted Pair Cable b) Power Cable c) SATA Cable d) VGA Cable
a) Twisted pair cable features pairs of copper wires that are twisted together
Which of the following are ways for transmitting data at the Ethernet level? (Select all that apply) a) Broadcast b) Unicast c) Duplex d) Multicast
a) Broadcast transmission is when one device sends data to every single device on a LAN b) Unicast transmission is when one device transmits data to another device. A unicast transmission is always meant for just one receiving address d) Multicast transmission is when one device transmits data to multiple devices
Which of the following are parts of an Ethernet frame? (Select all that apply) a) EtherType field b) Data payload c) Broadcast d) Preamble
a) EtherType field is 16 bits long and used to describe the protocol of the contents of the frame b) Data payload contains all of the data from higher layers, such as IP, transport, and application layers, that's actually being transmitted d) The Preamble is the first part of an Ethernet frame
What is the most common plug used with twisted pair network cables? a) Registered Jack 45 b) Registered Jack 11 c) Registered Jack 46 d) Registered Jack 35
a) Registered Jack 45
