Give an example of the application layer.
What are the main tasks of the apllication layer?
The main tasks of any application layer should be:
• Define communication of applications
• Define data types used
• Provide a service to the next lower layer
• Use the service of the next lower laye
What are examples of network types and applications using them?
Speech forwarding->Bluetooth (Headset)
throttle control to motor control->CAN (Intra-Car Communication)
email , WWW, Instant Messenger->Internet
Name protocols on the application layer.
A2DP, HTTP, XMPP
Sketch the structure of an application layer message.
What is the largest computer network on earth? Recount its general history.
The Internet is the largest computer network of earth. Its development started as a small research network of the US Ministry of Defense and evolved over the last 50 years.
Important steps of the Internets’ history are:
1969–1983 Development of the ARPANET (US Ministry of Defense), Propagation through Universities and military research center
1981–1993 Development TCP/IP, DNS, Usenet, more and more universities connect to the Internet
since 1989 Commercialization of the Internet, Private Individuals get Access
1997 fast development of the Internet in the society
since
2003 Development of the Web 2.0
since 2010 Cloud-Services
Sketch the groeth of the number of hosts within the Internet over the last 50 years.
What are important Application Layer protocols on the Internet?
Domain Name Service -> Adress Name resolution
Hypertext Tranfer Protocol -> fetching Websites
Simple Mail Transfer Protocol -> sending and exchanging E-Mails
Post Office Protocol V3 -> Fetching E-Mails (old)
Internet Message Access Protocol -> fetching E-Mails
Session Initiation Protocol -> Connecting VoIP
Remote Desktop Protocol -> Connect to a remote computers deskop
Secure Shell -> Connect to a remote Computers Terminal
Network Time Protocol -> Time synchronization of devices
What is the Domain name System?
The Domain Name System (DNS) is one of the most important building blocks of the Internets’ application layer. Its main purpose is the resolution of Fully Qualified Domain Names (FQDNs) to Internet addresses and vice versa. FQDNs represent human-readable names for computers.
What are advantages and disadvantages of E-Mail?
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