interface

Cisco Layer 2 Switch Functions

January 25, 2011

Layer 2 switch is A network device that forwards traffic based on MAC layer (Ethernet or Token Ring) addresses. Bridging technology has been around since the 1980s (and maybe even earlier). Bridging involves segmentation of local-area networks (LANs) at the Layer 2 level. A multiport bridge typically learns about the Media Access Control (MAC) addresses [...]

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How to configure Cisco SPAN Ports

January 25, 2011

The following example will demonstrate how to configure a single SPAN session on a Cisco Catalyst switch. The specifics are different between different switch models, so be sure to check the Cisco documentation. You must first configure source ports. Source ports are ports whose data will be copied, and sent to the destination, or SPAN [...]

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How to determine serial numbers for cisco router and Catalyst switch

January 25, 2011

For Cisco Routers If you want to know the chassis serial number for your router use the following command Router> sh inventory Output NAME: “2821 chassis”, DESCR: “2821 chassis”PID: CISCO2821  , VID: V04 , SN: FCZ10231VG NAME: “WAN Interface Card – Serial 2T”, DESCR: “WAN Interface Card – Serial 2T”PID: WIC-2T   , VID: V01, SN: [...]

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NetBEUI

January 24, 2011

NetBIOS, NetBEUI, and SMB are Microsoft Protocols used to support Microsoft Networking. The NetBIOS stack includes SMB, NetBIOS, and NetBEUI which are described in the table below. The following are parts of the Microsoft networking stack: Name Network Layer Description Redirector Application Directs requests for network resources to the appropriate server and makes network resources [...]

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Address Resolution Protocol

January 24, 2011

ARP and RARP Address Translation Address Resolution Protocol (ARP) provides a completely different function to the network than Reverse Address Resolution Protocol (RARP). ARP is used to resolve the ethernet address of a NIC from an IP address in order to construct an ethernet packet around an IP data packet. This must happen in order [...]

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Little About Dynamic Routing

January 24, 2011

Dynamic routing performs the same function as static routing except it is more robust. Static routing allows routing tables in specific routers to be set up in a static manner so network routes for packets are set. If a router on the route goes down the destination may become unreachable. Dynamic routing allows routing tables [...]

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Internet Group Management Protocol (IGMP)

January 24, 2011

Internet Group Management Protocol (IGMP) is the protocol used to support multicasting. To use multicasting, a process on a host must be able to join and leave a group. A process is a user program that is using the network. Group access is identified by the group address and the interface (NIC). A host must [...]

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Broadcasting and Multicasting

January 24, 2011

Network interface cards are usually programmed to listen for three types of messages. They are messages sent to their specific address, messages broadcast to all NICs, and messages that qualify as a multicast for the specific card. There are three types of addressing: 1. Unicast – A transmission to a single interface card. 2. Multicast [...]

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Little about BOOTP Protocol

January 24, 2011

BOOTP (Boot Protocol) may be used to boot remote computers over a network. BOOTP messages are encapsulated inside UDP messages and therefore its requests and replies are forwarded by routers. BOOTP is defined by RFCs 951 and 1542. The drawing below illustrates the data encapsulation: The diskless system reads its unique hardware address from its [...]

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10 things About Cisco Access list

January 21, 2011

What is an access control list? In the Cisco IOS, an access control list is a record that identifies and manages traffic. After identifying that traffic, an administrator can specify various events that can happen to that traffic. What’s the most common type of ACL? IP ACLs are the most popular type of access lists [...]

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Communication Devices in Computer Network

January 21, 2011

An electronic device that can send and receive data on the network is called the communication device. The communication devices are used on both ends of the connections. Most of the communication devices have the ability to convert the digital signal of computer into analog signal so that the signals can be transmitted on the [...]

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NAT and PAT Configuration on Cisco Router

January 18, 2011

There are two types of NAT that can be configured on a Cisco router; static, and dynamic. Static NAT Configuration: This type is used when you want to do one-to-one assignment of local IP addresses to global IP addresses. 1. Establish static translation between an inside local address and an inside global address, Router(config)#ip nat [...]

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Inter-VLAN Routing Configuration on Cisco Router

January 18, 2011

Requirements: You have to make sure that your router support the frame tagging technology used between the switches. Before jumping into the router configuration, you have to configure a port in the switch that will be connected to the router to be a trunk port. And keep remembering the VLAN tagging method that you configured [...]

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BRI ISDN Configuration On Cisco Router

January 18, 2011

There are two ways to configure ISDN in a Cisco router. The first one is to setup the ISDN connection to be always on. This method will be very costly because most ISDN service providers charge not only by monthly subscription, but by the amount of data that you transfer. Having the connection opened 24/7, [...]

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