Lesson 15

Question 1

Please do not tell (the) secret password to anyone ( acronym)

Answer 1

For data transmission : Physical, data link, network, transport, session

Question 2

What is DNS ( Domain Name System)

Answer 2

DNS is organized system - computers communicate assigning names/ people-friendly words to devices IP addresses

Question 3

How do name servers work within the DNS (Domain Name System)

Answer 3

If a computer needs to find a specific website, it asks a name server. If that server doesn’t have the information, it points to another name sever that might. (See DNS page 2 for highlighted answer)

Question 4

When is a DNS considered authoritative?

Answer 4

It contains the requested resource records for a particular name sever

Question 5

What is a resolver in a DNS

Answer 5

They’re programs on your computer (like in a web browser) that use the DNS to find the IP address of the website you want to visit.

Question 6

Recursive query vs iterative query

Answer 6

Recursive- makes local name server responsible for resolving the name , doesn’t except referrals to another name server
Iterative- will except referral to another name server

Question 7

When is a URL used?

Answer 7

When a web browser is requesting a record from a web server?

Question 8

What are the three parts of a URL?

Answer 8

Protocol, Host location, File path

Question 9

What does URL stand for?

Answer 9

Uniform Resource Locator

Question 10

What are clients ( in relations to servers)

Answer 10

devices or software applications that request and receive services or resources from a server.

Question 11

What does ISP stand for?

Answer 11

Internet Service Provider

Question 12

Intranet vs extranet

Answer 12

Intranet- Private networks using web technologies that permit local access
Extranet - private networks permitting remote access

Question 13

Secure Sockets Layer ( SSL)

Answer 13

Encryption and authentication of server

Question 14

What is a digital certificate?

Answer 14

Proves identify of the server. Server uses it for encryption ( it’s the Lock Screen in the left corner of address bar)

Question 15

What device is used to transfer packets between different networks ( packet switching) ?

Answer 15

Router

Question 16

What protocol allows people to use names or labels, rather than numeric addresses, to address, and network resources?

Answer 16

Domain Name System ( DNS))

Question 17

What is an IP address? What binary value does it use?

Answer 17

Number used to identify each device on a given network using a 32 bit binary value expressed as four decimal numbers, separated by periods

Question 18

Which email protocols are used to download messages from the mail server?

Answer 18

Post office protocol (POP) or Internet message access protocol (IMAP)

Question 19

Wide area Network?

Answer 19

Connects sites in different geographic locations. Make use of telecommunications rather than directly operated by network admin.

Question 20

Local area network (LAN)

Answer 20

Owned and operated by the company that uses it

Question 21

Difference between HTTP & HTTPS?

Answer 21

HTTPS serves SSL Secured, HTML webpages, HTTP is unsecured

Question 22

What protocol is usually used to provide logical addressing on networks?

Answer 22

Internet protocol (IP) - think IP address

Question 23

What is a packet made up of?

Answer 23

A number of fields contained within a header section plus a payload

Question 24

Which part of a friendly URL is managed by the DNS and is dependent on a name resolution service?

Answer 24

Top level domain (TLD)

Question 25

What is a protocol type

Answer 25

A part of the web address that describes the access method being used Example: HTTP://

Question 26

What is a file path?

Answer 26

Part of the web address that specifies directory and file name location

Question 27

What are the key features of a packet switching network?

Answer 27

Nodes within the network can perform a forwarding function, allowing a packet to utilize any available path through the network