Internet Protocols Flashcards by Deborah Avila

What are the 3 types of Network topology (the road)

– Ethernet,
DSL Digital Subscriber Line: It allows data to be transmitted over the same copper telephone lines
cable system

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What are two types of protocols (box’s in truck)

TCP - Transmission Control Protocol UDP – User Datagram Protocol

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TCP and UDP are encapsulated inside of what

The internet protocol

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TCP and UDP are a part of which layer in the OSI (Open Systems Interconnection) model

Layer 4 the transport layer

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How many layers are in the OSI model

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What does OSI model stand for

Open Systems Interconnection

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Does UDP and TCP use multiplexing

Yes

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Why is Transmission control protocol considered reliable

ensures that data is received correctly, and if any segments are lost during transmission, it requests retransmission.* Flow control
– The receiver can manage how much data is sent

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What is the difference ofUser Datagram Protocol (UDP) in contrast to TCP

it’s connectionless
* “Unreliable” delivery
– No error recovery
– No reordering of data or retransmissions
* No flow control
– Sender determines the amount of data transmitted

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What are two common connectionless protocols that use UDP

– DHCP (Dynamic Host Configuration Protocol)
– TFTP (Trivial File Transfer Protocol)

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What are two connection-oriented protocols that use TCP and give a return receipt

– HTTPS (Hypertext Transfer Protocol Secure)
– SSH (Secure Shell)

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IPV4 sockets require what from the client and the server in the packages

– Server IP address, protocol,
server application port number
– Client IP address, protocol, client port number

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what are Non-ephemeral ports_______
numbers 0 though:_____
Are they (mostly) assigned to the client or server

Permanent port numbers
0 - 1,023
Usually on a server or service

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TCP and UDP ports can be any number between

0 and 65,535

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Do port numbers provide security

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Can TCP and UDP port number be the same

Yes there can be a service running on TCP port 80
and a different service running on UDP port 80
but that can be confusing so we don’t tend to do it

What is ephemeral

Temporary

Some application on server side change port numbers (use ephemeral) T or F

True

If TCP is more reliable why would you use UDP

Real-time communication

What is DHCP (Dynamic Host Configuration Protocol) used for

To automatically assign IP addresses to our device

Ephemeral ports Temp can be port num ___ through_____

– Ports 1,024 through 65,535

What is FTP - File Transfer Protocol
What are 2 port numbers used by FTP

A protocol that transfers files from one device to another
tcp/20 (active mode data) tcp/21 (control)

Does SSH- secure shell use TCP or UDP
What port number does it use

TCP
Encrypted communication link - tcp/22

What is Telecommunication Network
Is it encrypted
what port number does it use

Remotely accessing and managing computers or network devices over a network-like Shell
- its not encryped
- tcp/23

What protocol do email servers use to send emails SMTP what port number does it use

Simple mail transfer protocol TCP/25

What 2 protocols are used to receive emails

– IMAP, POP3

What does DNS stand for What does it do What port does it commonly use

Domain Name System converts names to IP addresses UDP/53

What does DHCP stand for what does it do What 2 ports does it use The IP addresses assigned are dynamic meaning.....

Dynamic Host Configuration Protocol configuration of IP address, subnet mask and other options udp/67, udp/68 They are temporary once done using the go back into a pool

Network admin can use DHCP reservations which means

Can configure DHCP servers to assign the same IP address to certain devices

what does HTTP and HTTPS stand for what port does each one use

* Hypertext Transfer Protocol TCP/80 * Hypertext Transfer Protocol Secure TCP/443

POP3 and IMAP are protocols use to receive mail what do they stand for and what are their port numbers

POP3 tcp/110 Post Office Protocol version 3 IMAP4 tcp/143 Internet Message Access Protocol v4

Windows commonly use SMB to transfer files to other windows devices what does it stand for what port does it commonly use It's also called CIFS what does it stand for

Server message block TCP/445 Common Internet File System

Windows commonly use Server Message Block to transfer files to other windows devices what 2 protocols does it use to communicate to an older windows machine and what are their port numbers on most modern devices those 2 protocols aren't used and devices can communicate using a direct SNB connection using what port

NetBIOS udp/137 NetBIOS name service NetBIOS tcp/139 NetBIOS session service Direct SNB connection can be established using TCP/445 NetBIOS is an abbreviation of Network Basic Input/Output System. The primary purpose of NetBIOS is to allow applications on separate computers to communicate and establish sessions to access shared resources, such as files and printers, and to find each other over a local area network (LAN)

SNMP: simple network management protocol What is it you query devices requesting performance details using what port __ you can also configure the infrastructure device to monitor for certain metrics and if it exceeds any of those metrics it can send an alert call a TRAP what port does it use

a protocol used for managing and monitoring network devices Queries: udp/161 Traps: udp/162

What does LDAP stand for what does it do what port does it use hint: one common directory is Microsoft active directory

LDAP (Lightweight Directory Access Protocol) - Tcp/389 * Store and retrieve information in a network directory

RDP - Remote Desktop Protocol uses what port and is used for what

Share a desktop from a remote location over tcp/3389