Name lookup, user logon and logoff
What are common network functions on Layer 5?
manages data transfer from one application to another across a network (by breaking data down into smaller chunks called "segments" also includes flow control and acknowledgements to ensure reliability)
What does Layer 4 do?
every network technology has a maximum frame size called the maximum transmission unit (MTU)
Why is segmenting data important?
logical addressing, translates logical network addresses (IP addresses) into physical addresses, and performs best path selection and routing in an internetwork
What does Layer 3 do?
The router consults a list of rules before forwarding an incoming packet to determine whether a packet meeting certain criteria should be permitted through
What is access control?
P, ARP and ICMP (Routers also operate on this layer)
What operates on layer 3?
converts bits into signals for outgoing messages and signals into bits for incoming messages
What does Layer 1 do?
Wire media uses electrical pulses, fiber-optic uses light pulses and wireless media uses radio waves
What operates and how on Layer 1?
covers all forms of ethernet media and interfaces, from 10 Mpbs to 10Gbps
What is 802.3 Ethernet LAN?
Physical Layer
What is the first layer of the OSI Model?
Data Link Layer
What is the second layer of the OSI Model?
Network Layer
What is the third layer of the OSI Model?
Transport Layer
What is the fourth layer of the OSI Model?
Session Layer
What is the fifth layer of the OSI Model?
Presentation Layer
What is the sixth layer of the OSI Model?
Application Layer
What is the seventh layer of the OSI Model?
The functions of each layer communicate and interact with the layers immediately above and below it
How does the OSI model work?
handles data formatting and translation (how the data appears)
What does the sixth layer do?
a software component known as a redirector
What operates at the presentation layer?
Intercepts requests for service from the computer
What does the redirector do?
permits two computers to hold ongoing communications, called a "session" (establishing or disconnecting a session and determining which side can transmit data, and for how long)
What does the fifth layer do?