Networking Flashcards
What is the upper layer of the osi model
Application, implemented only in software e.g application, presentation and session
What are the lower layers of osi model
Transport e.g transport, network, data link, physical. The physical layer and the data link layer are implemented in hardware and software
What does the physical layer do
Manage the communication in the physical link
What does the link layer do
Provides reliable transit of data across a physical network link. Composed of two sub layers, logical link control (LLC) and media access control (MAC)
What does the network layer do?
Defines the network topology and the routing
What does the transport layer do?
Segments data and ensures error-free transmission
What does the session layer do?
Establishes, manages, and terminates communication sessions
What does the presentation layer do?
Provides a variety of coding and conversion functions that are applied to application layer data
What does the application layer do
Identifies communication partners, determines resource availability and synchronises communication
What do peer layers use to communicate?
Control Information (CI) which can either be a header or a trailer
How long is an up address
32 bits
What does the net mask do
Determines the length of the number portion of the address (first part)
Net mask is also an up address composed of what?
A continuous set of 1 followed by a continuous set of 0
What happens when the values of H bits are changed?
Obtain possible IP addresses of hosts within the network (N bits)
What happens if all H bits are 1?
The broadcast address is obtained, which is common for all networking devices in that particular network segment
