Networking

Question 1

Bus Topology

Answer 1

Host devices are connected to one centralized cable or hardware device by twisted pair wiring. Network travel goes both directions, so collisions can happen.

Question 2

Full Mesh Topology

Answer 2

All devices are connected to each other for redundancy. This is the most reliable, but it is expensive and time consuming because everything must be connected.

Question 3

Star Topology

Answer 3

A central device connects to network and host devices using twisted pair wiring.

Question 4

Ring Topology

Answer 4

All devices are connected using a single cable, and data is routed to each device. This avoids data collisions, but it is susceptible to the whole system failing if one node fails.

Question 5

Dual Ring Topology

Answer 5

Two rings enable data to be sent in opposite directions, creating redundancy. If one ring fails, the other continues to transmit data.

Question 6

Logical Topology

Answer 6

The logical representation of a network. May differ from the physical topology.

Question 7

Cat 5e

Answer 7

Cable rating that denotes 100 MHz frequency, 100 MBS data performance, 100 m channel length limit, a max data speed of 1 GBPS, and a length limit at max of 100 m. Can handle 1G ethernet.

Question 8

Cat 6

Answer 8

Cable rating that denotes 250 MHz frequency, 1 GBPS data performance, 100 m channel length limit, a max data speed of 10 GBPS, and a length limit at max of 37 m. Can handle 10G ethernet for a length up to 55 m.

Question 9

Cat 6a

Answer 9

Cable rating that denotes 500 MHz frequency, 10 GBPS data performance, 100 m channel length limit, a max data speed of 10 GBPS, and a length limit at max of 100 m.

Question 10

OSI layers

Answer 10

Application layer, presentation layer, session layer, transport layer, network layer, data link layer, physical layer. Layers 7 to 1 descending: All People Seem To Need Data Processing. Layers 1 to 7 ascending: Please Do Not Touch Steve’s Pet Alligator.

Question 11

Application Layer (OSI)

Answer 11

Interface between software applications and the network. Telnet, HTTP, FTP, SSH. Data.

Question 12

Presentation Layer (OSI)

Answer 12

Handles encryption, message formatting, and compression. ASCII, JPEG, PNG. Data.

Question 13

Session Layer (OSI)

Answer 13

Manages applications and establishes, maintains, and terminates user connections. Operating systems, scheduling. Data.

Question 14

Transport Layer (OSI)

Answer 14

Provides reliable or best-effort data delivery with optional error and flow control. TCP, UDP. Segments.

Question 15

Network Layer (OSI)

Answer 15

Provides logical end-to-end network addressing and routing. IP. Packets. Uses Router.

Question 16

Data Link Layer (OSI)

Answer 16

Uses MAC addresses to access network devices. Provides error detection but no correction. 802.3, 802.2, HDLC, FDDI, PPP, Frame relay. Frames. Uses Switch, Bridge.

Question 17

Physical Layer (OSI)

Answer 17

Bit stream. Specifies voltage, wire speed, and cable pin outs. EAI/TIA, V.35. Bits. Hub, Repeater, NIC.

Question 18

TCP/IP layers

Answer 18

Application, Transport, Internet, Network Access

Question 19

Application Layer (TCP/IP)

Answer 19

Provides network services to applications via services and protocols. Sockets and port numbers are used to differentiate the path and sessions on which applications operate. Message formatting and compression is provided. Telnet, HTTP, FTP, SSH, JPG, Operating Systems Scheduling. Data.

Question 20

Transport Layer (TCP/IP)

Answer 20

Provides reliable or best-effort data delivery with optional error and flow control. TCP, UDP. Segments.

Question 21

Internet Layer (TCP/IP)

Answer 21

Provides logical end-to-end network addressing and routing. IP. Packets. Router

Question 22

Network Access Layer (TCP/IP)

Answer 22

Encapsulates IP packets into frames for transmission. Maps IP addresses to physical hardware addresses (MAC addresses) and uses protocols for physical data transmission. 802.3, 802.2, HDLC, FDDI, PPP, Frame Relay. Frames, Bits. Switch, Bridge, Hub, Repeater, NIC.

Question 23

IPv4

Answer 23

Address composed of four octets between 0 and 255 (between 00000000 and 11111111) separated by ‘.’ Always 4 bytes, or 32 bits, long.

Question 24

Address Class A

Answer 24

0xxxxxxx, 1 to 127, 1.0.0.1 to 127.255.255.254