Networking 2 Reviewer - OSI, TCP/IP, and Cisco Commands

Vocabulary flashcards covering OSI model layers, TCP/IP, IPv4/IPv6 specifications, LAN design concepts, network hardware definitions, and essential Cisco CLI commands.

OSI Model

Open Systems Interconnection model consisting of 7 layers that explains how devices communicate over a network.

Layer 7: Application

The layer where network applications and services are used, allowing apps to use the network.

Layer 6: Presentation

The layer that formats data so other devices can understand it, handling formatting, translation, encoding, compression, and encryption/decryption.

Layer 5: Session

The layer that manages conversations between applications by starting, maintaining, synchronizing, and ending communication.

Layer 4: Transport

The layer responsible for delivering data from one application to another.

Layer 3: Network

The layer that decides where data should go by handling IP addresses, routing, packet forwarding, and path selection.

Layer 2: Data Link

The layer that handles communication between devices on the same local network using MAC addresses and frames.

Layer 1: Physical

The layer responsible for the actual physical transmission of data by sending bits.

TCP (Transmission Control Protocol)

A reliable (careful) transport layer protocol.

UDP (User Datagram Protocol)

A fast and simple transport layer protocol.

IPv4

Internet Protocol Version 4, which uses 32 bits (4 octets ranging from 0 to 255) and decimal numbers.

IPv6

Internet Protocol Version 6, which uses 128 bits (8 groups) and hexadecimal numbers, offering a much larger address space.

TCP/IP Model

A 4-layer network model consisting of Application, Transport, Internet, and Network Access / Link layers.

IPv4 Class A

IPv4 class with an address range of 1-127, default mask /8, used for very large networks.

IPv4 Class B

IPv4 class with an address range of 128-191, default mask /16, used for medium/large networks.

IPv4 Class C

IPv4 class with an address range of 192-223, default mask /24, used for small networks.

IPv4 Class D

IPv4 class with an address range of 224-239, used for multicast.

IPv4 Class E

IPv4 class with an address range of 240-255, used for experimental/reserved purposes.

Access Layer

The layer in hierarchical LAN design that connects directly to users.

Distribution Layer

The layer in hierarchical LAN design that acts as a connection point between Access and Core layers.

Core Layer

The backbone layer in hierarchical LAN design.

Redundancy

Having a backup system or link in place within a network.

Failure Domain

The part of the network affected when something fails; smaller domains result in less damage.

Link Aggregation

Combining multiple physical links into one logical link.

OSPF (Open Shortest Path First)

A link-state routing protocol designed for large networks featuring fast convergence.

Port Density

The number of ports a switch has.

PoE (Power over Ethernet)

A technology that carries electrical power to a device over a network cable.

Multilayer Switch

A device that performs both switching and routing.

Router

A network device that connects different networks.

In-Band Management

Managing a network device through the network or internet connection.

Out-of-Band Management

Managing a network device outside the network when the primary network connection is not available.

show ip route

Cisco command that displays the routing table.

show ip protocols

Cisco command that displays routing protocols.

show interfaces

Cisco command that displays interface information.

show ip interface brief

Cisco command that displays quick interface status.

show running-config

Cisco command that displays the current configuration.

show mac-address-table

Cisco command that displays MAC addresses.

show cdp neighbors

Cisco command that displays neighboring Cisco devices.

show port-security

Cisco command that displays port security information.

copy running-config startup-config

Cisco command that saves the current running configuration to the startup configuration.

erase startup-config

Cisco command that erases saved configuration.

reload

Cisco command that reloads the device.

delete flash:vlan.dat

Cisco command that deletes VLAN information from flash memory.