CCNA - 1 Networking Fundamentals

Briefly describe the process of encapsulation from Application to Network layer and their purpose.

1. Create and encapsulate data with any Application header+trailer required (ex. HTTP). 2. Encapsulate that data with Transport Layer header (ex. TCP/UDP). 3. Encapsulate that data with Network Layer header (ex. IP). 4. Transmit data.

What is the default MTU of a typical packet?

1500 bytes.

The OUI of a MAC address had what defining qualities?

24 bit unique address and assigned to manufacturer by IEEE.

What are the 4 layers of the TCP/IP model? And the alternate 5 layers?

4: Application, Transport, Internet, Link 5: Application, Transport, Network, Data Link, Physical

HTTP, POP3, and SMTP are examples of protocols for which layer?

Application Layer

If two devices transmit on the same pair of pins what type of cable is needed?

Crossover Cable

Ethernet, PPP, T1 are examples of protocols for which layer?

Data Link Layer

What is the broadcast address?

FF:FF:FF:FF:FF:FF

What type of data does the Link Layer send?

Frame

Which devices transmit on pins 3 and 6?

Hubs and Switches

What are some examples of devices that work at the Physical layer?

Hubs, Repeaters, Cables

Switches, wireless access points, and cable modems work at which layer?

Layer 2 (Data Link)

Which OSI layer defines the functions of logical network-wide addressing and routing?

Layer 3 (Network Layer)

Routers work at which layer?

Layer 3 (Network) THINK >>addressing<<

The bits that include the headers+trailer and encapsulated data is called:

PDU (Protocol Data Unit)

What type of data does the Network Layer send?

Packet

For a crossover cable which pins connect to which?

Pins 1 and 2 connect to pins 3 and 6.

Which pins does a PC transmit on?

Pins 1 and 2.

Which pins does a router transmit on?

Pins 1 and 2.

Which pins does a switch transmit on?

Pins 3 and 6.

What type of data does the Transport Layer send?

Segment

What is the purpose of CSMA/CD? What devices make use of this?

To detect and ultimately reduce collisions by changing transmission behavior of devices when a collision is detected. Hubs.

Only devices that use cabling are considered Ethernet? (T/F)

True