Lesson 15 Flashcards
(27 cards)
Please do not tell (the) secret password to anyone ( acronym)
For data transmission : Physical, data link, network, transport, session
What is DNS ( Domain Name System)
DNS is organized system - computers communicate assigning names/ people-friendly words to devices IP addresses
How do name servers work within the DNS (Domain Name System)
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)
When is a DNS considered authoritative?
It contains the requested resource records for a particular name sever
What is a resolver in a DNS
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.
Recursive query vs iterative query
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
When is a URL used?
When a web browser is requesting a record from a web server?
What are the three parts of a URL?
Protocol, Host location, File path
What does URL stand for?
Uniform Resource Locator
What are clients ( in relations to servers)
devices or software applications that request and receive services or resources from a server.
What does ISP stand for?
Internet Service Provider
Intranet vs extranet
Intranet- Private networks using web technologies that permit local access
Extranet - private networks permitting remote access
Secure Sockets Layer ( SSL)
Encryption and authentication of server
What is a digital certificate?
Proves identify of the server. Server uses it for encryption ( it’s the Lock Screen in the left corner of address bar)
What device is used to transfer packets between different networks ( packet switching) ?
Router
What protocol allows people to use names or labels, rather than numeric addresses, to address, and network resources?
Domain Name System ( DNS))
What is an IP address? What binary value does it use?
Number used to identify each device on a given network using a 32 bit binary value expressed as four decimal numbers, separated by periods
Which email protocols are used to download messages from the mail server?
Post office protocol (POP) or Internet message access protocol (IMAP)
Wide area Network?
Connects sites in different geographic locations. Make use of telecommunications rather than directly operated by network admin.
Local area network (LAN)
Owned and operated by the company that uses it
Difference between HTTP & HTTPS?
HTTPS serves SSL Secured, HTML webpages, HTTP is unsecured
What protocol is usually used to provide logical addressing on networks?
Internet protocol (IP) - think IP address
What is a packet made up of?
A number of fields contained within a header section plus a payload
Which part of a friendly URL is managed by the DNS and is dependent on a name resolution service?
Top level domain (TLD)
