CCNA1 Lesson 6 Datalink Layer

Because it manages how data is formatted for transmission and ensures reliable data transfer.

Because it is responsible for encrypting all network traffic.

Because it determines the physical layout of cables and devices only.

Because it manages user authentication and access control.

Encapsulating Layer 7 packets into Layer 5 frames

Performing error detection and rejecting corrupt frames

Routing data between networks

Exchanging frames between endpoints over the network media

Physical Layer

Data Link Layer

Network Layer

Transport Layer

Logical topology diagram

Physical topology diagram

Network topology diagram

Layered topology diagram

Branch sites are directly connected to each other

A central site interconnects branch sites

Branch sites must communicate through the central site

It is a version of the star topology

Mesh topology; high administrative and physical costs

Point-to-point topology; limited scalability

Hub and spoke topology; single point of failure

Star topology; limited redundancy

It allows direct communication between two devices, reducing latency.

It supports multiple devices on the same connection.

It is less expensive than other types of network connections.

It provides wireless connectivity.

Error detection and correction

Routing packets between networks

Encrypting data for security

Assigning IP addresses