CCNA

Clockrate merely allows the routers or DCE equipment to communicate properly

chappathi

User can directly connect to router through console port via console cable.

user can connect to router via Modem and modem is directly connected to auxillary port.

CCNA

Peer-to-Peer Network

Computers can act as both servers sharing resources and as clients using the resources.

Server-based Network

Provide centralized control of network resources and rely on server computers to provide security and network administration

When the computers on the network simply listen and receive the signal, they are referred to as passive because they don’t amplify the signal in any way.

A network in which there are multiple network links between computers to provide multiple paths for data to travel.

Gateway

A device connected to multiple physical TCP/IP networks capable of routing or delivering IP packets between them.

Router

It’s a layer 3 device that connects 2 different networks and routes packets of data from one network to another. It breaks up Broadcast domain as well as Collision Domain.

It’s a Hybrid device that combines the features of both bridges and routers.

Frame relay is an industry standard, shared access, switched Data Link Layer encapsulation that services multiple virtual circuits and protocols between connected mechanism.

Frame relay is a packet-switched technology.

A subnet is the subdivision of an IP network.

Switch:

Switches operate at Layer 2 Data Link Layer

Address Learning

Forward / Filter decision using MAC address

Loop Avoidance

Breakup collision domains

Switches create separate collision domains but a single broadcast domain

Hub:

Hub operates at Layer 1 Physical Layer

No Filtering

No Addressing

Hub creates single collision domain and single broadcast domain

Make forwarding to all the ports when signal is arrived

The use of software, installed on PC or LAN server, that allows the PC to function as if it were dumb terminal directly attached to a particular type of mainframe.

Telnet is also called as terminal emulation. It belongs to application layer.

An FDDI frame or Token Ring frame that points to serious problem with the ring, such as a broken cable. The beacon frame carries the address of the station thought to be down.

NetBIOS – Network Basic Input / Output System

An application-programming interface (API) that can be used by programs on a local area network (LAN). NetBIOS provides programs with a uniform set of commands for requesting the lower-level services required to manage names, conduct sessions, and send datagrams between nodes on a network.

NetBEUI – NetBIOS Extended User Interface

An improved version of the NetBIOS protocol, a network protocol native to Microsoft Networking. It is usually used in small, department-size local area networks (LANs) of 1 to 200 clients. It can use Token Ring source routing as its only method of routing.

A layer of a glass surrounding the center fiber of glass inside a fiber-optic cable.

In communication weakening or loss of signal energy, typically caused by distance.

The address for a device as it is identified at the Media Access Control (MAC) layer in the network architecture. MAC address is usually stored in ROM on the network adapter card and is unique.

ICMP – Internet Control Message Protocol

It is a Network Layer Internet protocol, which can report errors and status information. We can use the ping command to send ICMP echo request messages and record the receipt of ICMP echo reply messages. With these messages, we can detect network or host communication failures and troubleshoot common TCP/IP connectivity problems.