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Google Professional IT Support > The Bits and Bytes of Computer Networking > Flashcards

The Bits and Bytes of Computer Networking Flashcards

1
Q

What are the five layers of the TCP/IP Model

A
  1. Application Layer
  2. Transport Layer
  3. Network Layer
  4. Data Link Layer
  5. Physical Layer
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2
Q

Cat5 Cable (copper)

A
  • Uses voltage for transfer of data
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3
Q

Fiber Optic Cable (glass)

A

Uses bursts of light for transfer of data

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4
Q

What is a Switch?

A

A Layer 2 device that connects multiple networks or computers together and determines which to output first for effective communication

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5
Q

What is a router?

A

Layer 2 device that insects IP address in order to know where to send data.

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6
Q

what is DHCP?

A

Dynamic Host Configuration Protocol is responsible for assigning IP addresses to clients connecting to the network.

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7
Q

What is ARP?

A

Address Resolution Protocol is used to discover the hardware address of a node from an IP address.

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8
Q

What is Subnetting?

A

The Process of taking large networks and splitting into smaller individual subnetworks or subnets which each subnet will have its own gateway router.

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9
Q

What is CIDR?

A

Classless Inner Domain Routing expands on the concept of Subnetting by allowing for arbitrary network sizes instead of being listed by IP address classes.

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10
Q

A network has the ability to direct traffic toward all of the receiving services. What provides this ability in the transport layer?

A

Multiplexing

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11
Q

The concept of taking traffic that’s all aimed at the same node and delivering it to the proper receiving service is known as?

A

Demultiplexing

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12
Q

What are the layers of the OSI Model?

A
  1. Application
  2. Presentation
  3. Session
  4. Transport
  5. Network
  6. Data Link
  7. Physical
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13
Q

Ports 1024-49151 are known as what kind of ports?

A

Registered ports

  • Used for lots of other network services that might not be quite as common any user of any privilege can access these ports.
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14
Q

The instantiation of an endpoint in a potential TCP connection is known as a?

A

Socket

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15
Q

Which field in a Transmission Control Protocol (TCP) header provides the next expected segment?

A

The Acknowledgment Number

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16
Q

A device involved in a Transmission Control Protocol (TCP) connection is ready to close the connection. The other device in the connection agrees. What has occured?

A

A Four-way handshake. (FIN > ACK > FIN > ACK)

17
Q

The data offset field in the TCP header is?

A

A 4-bit number that communicates how long the TCP header for this segment will be.

18
Q

Ports 1-1023 are known as what kind of ports?

A

System ports

  • Represents the official ports for most well-known network services and administrator-level access is needed to start a program that listens on a system ports.
19
Q

Ports 49152-65535 are known as what kind of ports?

A

Private or Ephemeral ports

  • Can’t be registered with the IANA and are generally used for establishing outbound connections.
20
Q

What is Port Forwarding

A

A technique where specific destination ports can be configured to always allow inbound traffic.

21
Q

How many Addresses does IPv4 have?

A

4.2 Billion

22
Q

What is NAT

A

Network Address Translation (NAT) Is a technology that allows a gateway usually a router or firewall, to rewrite the source IP of an outgoing IP datagram while retaining the original IP in order to rewrite the response. This includes IP masquerading.

23
Q

what kind of Resource Record is responsible for resolving an IP to a domain name?

A

Pointer Resource Record (PTR)

24
Q

The final step of the DHCP Discovery process is known as?

A

DHCPACK

  1. DHCPDISCOVER
  2. DHCPOFFER
  3. DHCPREQUEST
  4. DHCPACK
25
Q

The “www” portion of a domain is known as Subdomain and what else?

A
  1. Subdomain

2. Host Name

26
Q

An IT systems engineer creates a new Domain Name System (DNS) zone that contains pointer (PTR) resource records. Which zone type has been created?

A

Reverse Look up zone?

27
Q

Network Address Translation (NAT) technology provides a solution for which network problems?

A

Address Exhaustion

28
Q

What port on a name server is used for User Datagram Protocol (UDP) name request packets?

A

Port 53

29
Q

A complete Fully Qualified Domain Name (FQDN) is limited to how many characters?

A

127 Levels with 63 characters per section and total of 255 for the entire FQDN

30
Q

During the name resolution process, which technique is used to avoid congestion when querying a server?

A

Anycast

Google Professional IT Support (2 decks)

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