Application Protocols
Application protocols can be divided into two categories such as HTTP that are used by users and DNS which help and support protocols used by users. In this assignment, we were to learn about common application protocols including HTTP, IMAP, SMTP, SSL, and VOIPIn and view several online Application Protocol Tutorials by Professor Messer. Below are the questions that we had to answer.
Application Protocol Questions
- How does the Application level of the TCP/IP model map to the ISO/OSI model?
- The primary difference between FTP and TFTP is user authentication. What is meant by the term "user authentication?"
Authenticate with a user name and password - Which protocol is used most often for sending mail between mail servers?
SMTP Simple Mail Transfer Protocol - Which mail protocol would you use for receiving mail?
POP3 - Post Office Protocol V3 - If you are using a conventional browser to surf the Internet, what protocol(s) are you most likely using?
HTTP Hypertext Transfer Protocol or HTTPS Hypertext Transfer Protocol Secure - If you are buying a product on Amazon or checking your bank balance online, what protocol should you be using?
HTTPS through TLS/SSL - Who created SSL?
Netscape - What is TLS? Who created it?
Transport Layer Security was created by IETF (Internet Engineering Task Force) - Name common Voice over IP (VoIP) protocols.
SIP Session Initiation Protocol - Which protocol actually sends your voice across the network?
RTP Real-Time Transport Protocol
DNS Protocol Questions
- What is the difference between a routable and a non-routable protocol?
Routable protocols use network addresses that allow data to be transported to the destination in a network. Non-routable protocols have no network addresses and use the device address - To connect separate routable networks, what hardware device would be appropriate?
Router - In TCP/IP, what physical device is called the default gateway?
Router that connects to the WAN - What is DNS?
Domain Name Service is the server service that maps domain names to IP addresses - Briefly describe the DNS query/response process.
Resolver will look at local files or send a request to local Name Server to get to the DNS. Local Name Server makes request to Root Server Root server sends message back to local Name Server by giving Ip address for .com Name server. Local Name server sends request to .com Name server and send IP address for DNS. Local name server sends request to Name Server and Name server sends Ip address to local name server where it caches it and sends it back to the resolver. - What is DHCP (Dynamic Host Configuration Protocol)?
Dynamically assigns IP addresses to computers when they connect to the network - Briefly describe the DHCP process
When a device is plugged into a LAN, it send a DHCP broadcast message out requesting an IP address. DHCP server will send IP address and user will accept it. The DHCP server will acknowledge and complete the process.
