Chapter 21 - The Internet

Question 1

MAN stands for what?

Answer 1

Metropolitan Area Network. Is a WAN that spans an entire city.

Question 2

Internet

Answer 2

is the largest WAN that is composed of many organizations that connect to each other.

Question 3

NOCs or Tier 1

Answer 3

Network Operation Centers. Secure buildings that house large internet routers. That is a tier 1 network provider.

Question 4

Tier 2

Answer 4

Cover small area’s and have no peering agreements.

Question 5

Tier 3

Answer 5

the big internet service provider companies, such as Comcast, AT&T. That sell internet services to individual people and corporations.

Question 6

Dial-up

Answer 6

POTS (plain Old Telephone Service) or PSTN (Public Switched Telephone Network).

Question 7

Dial-up speed

Answer 7

Dial-up runs at 56kbps Max

Question 8

ISDN stands for what?

Answer 8

Integrated Services Digital. Which is another form of dial-up. Faster form of dial-up still seen today.

Question 9

broadband connection

Answer 9

Typical way we connect to the internet cables, DSL, wireless. Always connected to the internet

Question 10

DSL stands for what?

Answer 10

Digital Subscriber Line(DSL). Earliest version of broadband using telephone lines.

Question 11

modem

Answer 11

an old dial up modem. Were you would use a dial up connection.

Question 12

Two forms of DSL

Answer 12

Asymmetric DSL(ADSL) and Symmetric DSL(SDSL).

Question 13

ADSL

Answer 13

Asymmetric DSL(ADSL). Upload speed is much slower than your download speed.

Question 14

SDSL

Answer 14

Symmetric DSL(SDSL). Upload and download speed are the same.

Question 15

PPoE stands for what?

Answer 15

Point-to-Point Protocol Over Ethernet(PPoE). Which is the internet type you have to use to use DSL.

Question 16

DOCSIS stands for what?

Answer 16

Data Over Cable Service Interface Specification(DOCSIS).

Question 17

Firewalls do what?

Answer 17

Block ports on an incoming vs. outgoing concept.

Question 18

Internet connections require what?

Answer 18

a client and a server.

Question 19

FTP stands for what?

Answer 19

File Transfer Protocol(FTP). Used to transfer files from one system to another. Every web browser is a FTP client usually using port 21.

Question 20

Passive mode

Answer 20

means everything is done on port 21.

Question 21

Active mode

Answer 21

Is faster than passive but has issues with source port 20 instead of 21.

Question 22

Port triggering

Answer 22

Port triggering is used to allow incoming port numbers into router that it would block. seen a lot of times with video games.

Question 23

Email Protocols

Answer 23

Simple Mail Transfer(SMTP) runs port 25, Post Office Protocol(POP) runs on port 110, Internet Message Protocol(IMAP) runs on port 143.

Question 24

SMTP

Answer 24

Simple Mail Transfer is the protocol we use to send email to an SMTP server.

Question 25

POP or POP3

Answer 25

Sends emails down to the email client or pulls email down from the email server, but you have to configure your own folders.

Question 26

IMAP or IMAP4

Answer 26

Also sends emails down to the email client or pulls email down from the email server, but configures your folders for you. And is very popular today.

Question 27

Email today is what?

Answer 27

Secured mail. Will usually never see SMTP on port 25 or 587.

Question 28

Proxy Servers

Answer 28

Popular servers used to today to provide firewalling, check for malware, and ban bad URLs. Used a lot in schools to keep kids to go to certain websites.

Question 29

Proxy Servers can also do what?

Answer 29

Caching. Which helps with users getting to a commonly used website or location.

Question 30

VPN stands for what?

Answer 30

Virtual Private Networking(VPN). Uses the internet to create a private connection to a remote network.

Question 31

VPN Tunnel

Answer 31

when connected to the VPN. It a tunnel from your computer to the network.

Question 32

Internet of things(IoT)

Answer 32

Means giving internet capability to devices not traditionally associated with the internet.

Question 33

IoT use what standard?

Answer 33

802.11, zigbee or z-wave.