OSI/TCP/IP Related Flashcards
What devices operate at layer 1 of the OSI model?
Cabling and Hubs
What is the associated PDU at layer 1?
Bit
Segment
Datagram
Packet
Frame
Bit
How long is a MAC address?
48 bits
48 bytes
12 hexadecimal characters
56 megabytes
Both 48 bits and 12 hexadecimal characters
What is encapsulation?
Putting a “wrapper” around data for easier transmission
What does FCS stand for?
Frame Check Sequence
What pieces encompass a frame?
Destination MAC address
Source MAC address
Destination IP
Source IP
Port
FCS
Destination MAC address
Source MAC address
FCS
How does the FCS verify that the receiving NIC received the data intact?
Cyclic redundancy check
What is the maximum size of a traditional frame?
1500 bytes
What devices operate at layer 2 of the OSI model?
NIC
Switch
What are the two major “jobs” of a NIC?
LLC
MAC
What does the LLC do in a NIC?
Handles flow control
Talks to the operating system (via drivers)
What is the PDU at layer 3 of the OSI model?
Packets
What is the PDU used at layer 4 of the OSI model?
Segment
What are the primary functions of the Transport Layer?
Segmentation/reassembly
What is included in a TCP Segment?
Source Port
Destination Port
Sequence Number
Acknowledgement Number
What is the range of available ports?
1-65,536
What is included in a UDP datagram?
Source Port
Destination Port
Length
Checksum
What does layer 5 of the OSI model do?
Session tracking/naming
What happens at layer 6 of the OSI model?
Data conversion
Defines how two devices should encode, encrypt, and compress data.
What are the layers of the TCP/IP Model?
Application
Transport
Network
Network Access
