Chapter 10 Flashcards
What is multicast address
Multicast address is stored in LAN NIC.On receiving frame on NIC it checks multicast address matching.
What are 2 methods to indicate the frame type to receiver
- Explicit frame type
2. Implicit frame type
What is frame type field
A field in frame that carry information to identify frame type
What is explicit frame type
Receiver can check easily by going inside frame explicit type to check content type. Sender and receiver both agreed to allocated a part of frame that contain content type info.
What is implicit frame type
In this type receiver must infer type of frame data and receiver and sender both agree to use one content type.
What is format of an ethernet frame
It has 2 parts
- Header (receivers first receives it. All addresses are stored here)
- Data area/payload (data is embedded here).
Which area of frame fixed and which is not fixed
Header is fixed
and data area is not fixed
What is preamble
Preamble is the part of frame located before header and used for receiver synchronization. It has 8 bytes all are 1s and 0s.
What is the size of data area/payload area
46-1500 bytes
What is the last part of frame
CRC (4 bytes)
What is SNAP/LLC
Sub network attachment point/ Logical link control resolves the solution of the problem that if in implicit frame type both machines allocate different types of content. SNAP/LLC use to identify the type field inside of frame.
What is OUI
Organizationally unique identifiers used inside SNAP/LLC
What is network analyzer
It is used to monitor the performance of a network
What is promiscus mode of network analyzer
In this mode, network analyzer ignores the address type of frames and make copy of all frames. It use these frames to generate the statistics of the network.
