CCNA

What Is MAC Address ?

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mac address

MAC ( Media Control Access ) is the unique address which is attached by vendors to the network interfaces. This address information is held on ROM. MAC addresses are used by many network technologies like ethernet. Vendor and type of the network interface card can be known from MAC address. Purpose of the MAC address […]

CCNA

Network Topology Types

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Network topology is the map that defines how network devices connect each other. Topologies define the structure of the network. There are two types of topology definition : Logical Topology Logical topologies define the method used for accessing the media. Most common logical topologies are broadcast and token-passing. Physical Topology Physical topologies defines the current […]

CCNA

Firewall: Protect Your Network Perfectly

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firewall

Firewall is a networking device provides protection against threads to your network. Basicly, firewalls are softwares or hardwares designed for protecting networks from bad codes, viruses, hackers or spam web sites etc. Generally software firewalls are used for small-sized networks, hardware firewalls are used for large scaled corporate networks. They sit between LAN and WAN and protects […]

CCNA

What Is Router ?

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Router is a network device which provides ip routing according to its routing table. Routing table is the table, where the best routes to the destination networks appear. Router checks the source and destination addresses of the packet and sends it to receiver via dynamic ip routing protocols or static routes. Static route is the […]

CCNA

What Is Network Switch And How It Works

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Switch is a networking device which forwards frames according to its MAC Address Table. It presents a switched path to the devices which are connected on it. This is the biggest difference between a switch and hub. While two network device trying to communicate each other which is connected to a switch, other network devices […]

CCNA

TCP/IP Explained

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TCP/IP protocol represents two protocols embedded to TCP /IP stack which are used for data streaming: Transmission Control Protocol (TCP) and Internet Protocol (IP). TCP/IP is the most common protocol used for providing communication between two network devices. OSI Model has 7 layers while TCP/IP has 4 layers which are application, transport, internet and network interface. […]

CCNA

Osi Model : 7 Layer Of The Network Communication

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osi model

OSI ( Open Systems Interconnection ) model was developed by ISO ( International Organization for Standardization – Technical Committee 97 ) in 1978. This model was fixed a little bit and published as “OSI Reference Model” in 1984. OSI model, which is accepted by all world very quickly, basicly defines how network devices communicate together. Before […]

CCNA

What Is Wide Area Network ( WAN ) ?

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Wide Area Network ( WAN ) refers to a large scale network. If you have more than one Local Area Network and are connecting them, you are creating a Wide Area Network ( WAN ). A WAN may occur more than one offices, homes, schools or etc. There should be large distances between that places. […]

CCNA

What Is LAN ( Local Area Network )

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A LAN ( Local Area Network ) refers to a small sized network which is mostly directly connected or connected with a hub , switch or access point. There is not any backbone routers / switches in a local area network like MPLS or ATM. LAN devices are in the same office, home or school. […]

CCNA

Network Infrastructure Explained

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network infrastructure

Network infrastructure is the topology which consists of many network devices connected together. Today we need to have a large scale network to provide efficent communication. For example, we don’t use just computers, we use access-points, switches, hubs, printers, cables as well. All these are network elements and that creates network infrastructure. What if we […]