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Network operating systems > week 2 lecture > Flashcards

week 2 lecture Flashcards

1
Q

what does TCP/IP stand for?

A

Transmission Control Protocol / Internet Protocol

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2
Q

what is a network?

A

two or more computers connected with a medium for the purpose of sharing resources

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3
Q

what is a network protocol?

A

an internationally accepted set of rules for connecting computers to the internet and most other networks

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4
Q

what is TCP/IP?

A

a protocol suite that encapsulates a number of different protocols for different network communication tasks

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5
Q

what are the 5 layers of TCP/IP?

A
  1. Application ———–
  2. Transport (software)
  3. Internet ———–
  4. Network interface ———-
  5. Physical (hardware)
    ———-
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6
Q

what is the application layer?

A

-programs talk to the application layer
- programs will use different application protocols depending on the required task

-sends data -> transport layer
- receives data <- transport layer

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7
Q

what are the application protocols?

A

-FTP
-SMTP
-DNS
-HTTP
-SSH

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8
Q

what is the role of the transport layer?

A

coordinates the delivery of data from one location to another on the network

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9
Q

how does the transport layer send data?

A

-breaks the message up into packets
-add correction info

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10
Q

how does the transport layer receive data?

A

-reassemble packets into the original message
-carries out error checking
-identifies proper application to deliver message to

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11
Q

what protocols are used in the transport layer?

A

-TCP
-UDP

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12
Q

what is the role of the internet layer

A

-implementation the rules of internet addressing
- adds addresses to packets
-routers implement internet layer
- select the next-hop host and transmit packet by passing to Network interface Layer
-pass packets to appropriate transport layer protocol

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13
Q

what is the role of the network interface Layer?

A

-defined by the type of physical network the device is connected to (Ethernet)
-receiving: delivers to appropriate internet layer protocol
-sending: specifies internet layer protocol
- assembles final frame that will be sent over network

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14
Q

What is the physical layer?

A

-consists of cables or other connection media
-deals with data as bits travelling across a network medium
- convert packets to electricity or electromagnetic waves

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15
Q

what is internet protocol?

A

-contains addressing information that enables packet to be routed
- 2 basic functions are addressing and fragmentation

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16
Q

what is ICMP?

A

Internet Control Message protocol

used to generate IP error messages

17
Q

what is TCP?

A

Transmission Control Protocol

connection- oriented protocol

18
Q

What is UDP?

A

User Datagram Protocol

connectionless protocol

19
Q

what is an IP address

A

a unique number that identifies a computer or device on a TCP/IP network

20
Q

what is a static IP?

A

manually assigned IP by user

21
Q

what is a dynamic IP?

A

assigned when a computer connects to a network by DHCP

22
Q

what is DHCP?

A

Dynamic Host Configuration Protocol

23
Q

what are the 2 parts of an IP address?

A
  1. network ID
  2. host ID
24
Q

what is a network switch?

A

connects devices on a computer network and allows for communication between these devices

25
Q

what is a router?

A

-used to connect networks and forwards packets to their destinations
-allows for communication between computers with different network IDs

26
Q

what is a network gateway?

A

-node in a network that connects 2 networks with different transmission protocols together

27
Q

what is a subnet mask?

A

used to determine which park of an IP address is the network ID and which is the host ID

28
Q

what is an IP address class?

A

IP addresses are divided into 5 classes to accommodate varying network sizes (A.B.C.D.E)

Network operating systems (11 decks)

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