My Netwok Dictionary

You might recall from our brief description of the protocols used in a setting IPX, it is an routable protocol and the routing information protocol (RIP) is used to propagate routing information.

The IPX version of RIP is quite similar to the IP version. Function essentially the same way, the routers periodically broadcast the contents of their routing tables and other routers are gathered listening and integrating the information they receive. Nodes only need to know your local network and make sure to send datagrams to other destinations through its local router. The router is responsible for collecting and redirects these datagrams to the next hop of the route.

In an IPX environment, we need to spread the net a second kind of information. Announcement Protocol (Service Advertisement Protocol, SAP) carries information about what services are available in which nodes in the network. For example, SAP is the protocol that allows users to obtain lists of file servers and network printing. Read the rest of this entry »

To enable interoperability of management in the different network platforms have been established network management standards for providers to implement and comply with them.

There are two main standards:

• Simple Network Management Protocol (SNMP) – Community of IETF
• Common Management Information Protocol (CMIP) – Community of telecommunications.

SNMP actually refers to a set of standards for network management which includes a protocol, a specification of the structure of the database and a set of data objects. The SNMP was adopted as a standard for TCP/ IP in 1989 and became very popular. In 1993 it adopted an update known as the SNMP version 2c (SNMPv2c). Read the rest of this entry »

From the point of view, telephone, the protocol takes care of the voice signal for the establishment, management and culling call is SIP (Session Initiation Protocol). It is a protocol developed by IETF as a standard (RFC 3261) and supported in the client’s on-board mobile phone from Nokia.

The same SIP, then handles the message from the server side, ie the IP PBX, Cisco. The router in fact, the CME configuration, you can use two main VoIP protocols: a Cisco proprietary protocol called Skinny Protocol (SCCP), which is precisely the SIP. For an introduction to the protocol from the point of view, Cisco, see the documents listed on the site. Read the rest of this entry »

To configure Cisco routers, you must enter the user interface of the router using a terminal or remote access. When accessing a router, the user must log before executing any other command.

For security reasons, the router has two levels of access to commands:

• User EXEC mode: Typical tasks include checking the status of the router. Changes to the configuration of the router are not allowed in this mode.
• Privileged EXEC mode: Typical tasks include changes to the configuration of the router. The request for entry of user EXEC mode is displayed at login to the router. The commands available at the user level are a subset of available commands at the Privileged EXEC mode. For the most part, these commands allow the user to view information without changing the configuration of the router.

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This article teaches how to create a logical topology without loops. Redundant network topologies are designed to ensure that networks continue to function in the presence of single points of failure. The users’ work suffers fewer interruptions as the network continues to function. Any disruption caused by a fault should be as short as possible.

Reliability increases due to redundancy. A network based on switches or bridges present redundant links between those switches or bridges to overcome the failure of a single link. These connections introduce physical loops in the network. These bridging loops are created so that if one link fails, another link may take over the function of sending traffic. Read the rest of this entry »

This article describes the Rapid Spanning-Tree Protocol.

• The Rapid Spanning Tree Protocol defined in IEEE 802.1w LAN standard. The standard and protocol introduce new features: clarification of port states and roles.
• Definition of a set of link types that can move quickly to the state sent.
• The concept of allowing switches in a network in which there is convergence generates BPDUs instead of transferring the root bridge BPDUs.

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PPP uses a layered architecture. The layered architecture is a model, logical design or plan that helps communication between interconnected layers. The model for Open Systems Interconnection (OSI) layered architecture is used in networking. PPP provides a method for encapsulating multi-protocol datagrams on a link from point to point and uses the data link layer to test this connection. Therefore, PPP is composed of two sub-protocols:

• Link Control Protocol, is used to establish the link point to point.
• Network Control Protocol is used to configure different network layer protocols.

You can configure PPP on the following types of physical interfaces:

• Serial asynchronous
• Serial synchronous
• High Speed Serial Interface (HSSI)
• Integrated Services Digital Network (ISDN)

PPP uses the Link Control Protocol (LCP) to negotiate and configure the link control data from the WAN. PPP uses the component of the Network Control Protocol (NCP) to encapsulate and negotiate options for different network layer protocols. The PCL is located at the top of the physical layer and is used to set up, configure and test the data link connection. Read the rest of this entry »

For the NMS communicates with network devices, its must enable and configure your SNMP community strings. These devices are configured using the commands described in the paragraphs below.

It allows more than one read-only string. In most systems this community string is public by default. Not recommend using the default on corporate networks. To set the community string read-only be used by the agent, use the following command:

Router (config) # snmp-server community string ro

• String: The community string that acts as a password and gives you access to the SNMP protocol.

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A gateway is a device or element belonging to the network is configured to provide the PC that make up the network to go abroad, usually performing operations for this IP address translation (NAT: Network Address Translation).

This address translation capability allows you to apply a technique called IP masquerading, used very often to give Internet access to computers on a local area network sharing a single Internet connection, and therefore a single external IP address or arguably a public address. Read the rest of this entry »

If using a PLIP link to connect two machines, things are a little different from that seen in an Ethernet. PLIP If a link is known as point-to-point, which means that only one machine at each end of the link. A network like Ethernet is called broadcast networks. The configuration of point to point links is different because unlike broadcast networks, the links are point to point network themselves.

PLIP provides very cheap and portable connection between computers. As an example, consider a laptop from an employee at the Virtual Brewery that is connected to vlager via PLIP. The laptop is called vlite and has only one parallel port. During startup, this port will be registered as plipl. To activate the link, you have to configure the interface using the following commands: Read the rest of this entry »