TCP/IP Basics Chapter 6 Flashcards

1
Q

What does the command line Address Resolution Protocol (ARP) do?

A

Protocol used with CMD line command to determine mac address of a an ip address.

CMD command: arp

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2
Q

What is a subnet mask?

A

The value used in tcp/ip settings to divide the ip address of a host into its component parts. Which are network id and host id

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3
Q

Define Class A Ip Address

A

First Decimal Value: 1-126
Addresses: 1.0.0.0 - 126.255.255.255
Host per network ID: 16,777,216

Binary Octet Begins with: 0

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4
Q

Define Class B IP Addresses

A

First Decimal Value: 128-191
Addresses: 128.0.0.0 - 191.255.255.255
Host per network ID: 65,534

Binary Octet Begins with: 10

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5
Q

Define Class C Ip Address

A

First Decimal Value: 192-223
Addresses: 192.0.0.0 -223.255.255.255
Host per network ID: 254

Binary Octet Begins with: 110

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6
Q

Define Class D IP Addresses

A

First Decimal Value: 224-239
Addresses: 224.0.0.0 -239.255.255.255
Host per network ID: multicast

Binary Octet Begins with: 1110

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7
Q

Define Class E Ip Addresses

A

First Decimal Value: 240-255
Addresses: 240.0.0.0 - 255.255.255.255
Host per network ID: experimental

Binary Octet Begins with: 1111

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8
Q

What is classful?

A

IPv4 address scheme that relied on original class blocks such as Class A, they are obsolete

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9
Q

What is Classless?

A

IPv4 addressing scheme that does not rely on the original class blocks.

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10
Q

What is CIDR?

A

Classless Inter-Domain Routing
The basis of allocating and routing classless addresses, not restricting subnet masks to /8 /16 or /24 which classful addressing did

Based on variable-length subnet masking where subnets can be allocated according to the needs of an organization

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11
Q

What is Subnetting?

A

Taking a block of ip addresses and chopping them into multiple smaller groups!

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12
Q

What is difference between static and dynamic IP addresses

A

Static: Assigning ip addresses by manually typing them into a computer
Dynamic: Way for computer to receive IP information automatically from a server program DHCP

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13
Q

What is DHCP?

A

Dynamic Host Configuration Protocol

Sets TCP/IP settings for a client automatically on a network

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14
Q

Which port does DHCP use?

A

Server UDP 67
Client UDP 68

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15
Q

What is the DHCP 4-way handshake?(DORA)

A

DISC
OFR
REQ
ACK

DORA

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16
Q

What is a DHCP Lease?

A

Created by DHCP Server to allow a system requesting DHCP IP information, to use that information for a certain amount of time.

17
Q

What is a DHCP Relay?

A

Router feature that when enabled accepts DHCP broadcasts from clients and sends them via unicast directly to the DHCP server. In common terms, DHCP communications can cross from one network to another if this is enabled.

AKA DHCP Relay Agent

18
Q

What is a DHCP Scope?

A

The pool of IP addresses the DHCP may allocate to clients requesting IP addresses or other IP information, like DNS server addresses.

19
Q

What is DHCP Snooping?

A

Switch process that monitors DHCP traffic filtering DHCP messages from untrusted sources. Typically used to block attacks that use a rouge DHCP server.

20
Q

What is the Automatic Private IP address (APIA)?

A

169.254.0.0/16
Networking feature in OS that enable clients to self configure an IP address and subnet mask automatically when a DHCP serve is not available.

Used if computer has issues getting an IP address from DHCP server

Can connect to other computers on network but cannot access internet.

21
Q

What is the loopback ip address?

A

127.0.0.1

22
Q

What are Private IP Address Ranges?

A

10.0.0.0 - 10.255.255.255 (1 Class A network Block)
172.16.0.0 - 172.31.255.255 (16 Class B Network Blocks)
192.168.0.0 - 192.168.255.255 (256 Class C network Blocks)

All other IP address are public IP address