To achieve connectivity through a VLAN trunk between switches, the VLAN must be configured on each switch.
The VLAN Trunking Protocol (VTP) provides a simple means of maintaining a consistent VLAN configuration throughout the switched network. VTP allows switched network solutions easily scalable to other dimensions, reducing the need for manual configuration of the network. Read the rest of this entry »
When configuring VTP mode is important to choose appropriate as VTP is a very powerful tool and can create problems in the network. In a single domain VTP VLAN information configured on the server is transmitted to all clients
VTP operates in three modes:
• Server mode
• Client mode
• Transparent mode Read the rest of this entry »
Depending on the WAN technology is used to configure the right kind of scope.
The following command in interface mode enables the encapsulation:
Router (config-if) # encapsulation [encapsulation type]
Among the WAN encapsulation types are listed:
• HDLC, High-Level Data Link Control, is the default encapsulation type for Cisco routers, is a protocol synchronous data link owner.
• PPP, Point-to-Point Protocol is a standard protocol that provides connections from router to router and network host. It uses synchronous and asynchronous links. Use authentication mechanisms such as PAP and CHAP. Read the rest of this entry »
Introduction
NAT (Network Address Translation) can access the Internet by translating the private addresses into registered IP addresses. Increased security and privacy of your home network to translate the internal address to one external.
NAT has several forms of work as required and flexibility is available, either of which is extremely important in controlling the outbound traffic:
Static NAT allows one to one mapping between local and external addresses or global.
Dynamic NAT allows a network to assign internal IP to external number included in a group or pool of addresses.
PAT (Port Address Traslation) is a form of dynamic NAT assigns multiple IP addresses internal to external one. PAT uses source port numbers are unique in the global address internal to distinguish between the different translations. Read the rest of this entry »
The first step in configuring Frame-Relay is the activation of the interface that connects to the router with a CSU / DSU, in turn connected to the switch of supplier.
In addition to the IP address must be set the encapsulation type:
• No IETF cisco equipment.
• Cisco equipment, for choosing this encapsulation will not need to specify it.
Router (config) # interface serial 1 Read the rest of this entry »
Router (config-if) # ip address [IP + direction mask]
Router (config-if) # encapsulation frame-relay [cisco / ietf]
Router (config-if) # bandwidth [bandwidth value in Kbps]
By establishing a connection to a CSU / DSU can supply various PVC on a single physical connection. For this purpose it is necessary to configure subinterfaces act as logical interfaces connected to the PVC.
A subinterface is no default connection and can be configured as:
Point to point: each subinterface PVC provides a direct connection point to point with a corresponding remote router. The routing update traffic is NOT subject to the rule of split horizon.
Multipoint: a subinterface PVC provides multiple connections through the Frame-Relay cloud to multiple physical interfaces or subinterfaces on remote routers. The routing update traffic is subject to the rule of split horizon. Read the rest of this entry »
Suppose we have a network like this:
Interfaces on the routers:
LAN: FastEthernet0 / 0
WAN-VPN: Serial0 / 0
Based in: 10.1.1.0/24
See B: 10.1.2.0/24
PtP Link: xyzk/30
The two sites communicate via an IPsec VPN tunnels. We are not here to cover the configuration of a VPN with IPsec and ISAKMP, but what if you want to go out on a host of Internet-based via NAT? Cisco IOS process before the rules after those of NAT and VPN, L3 changing the source address of the package with ‘Inside Global Address (xyzk) thus causing the non-match ip source that activates the IPsec tunnel. Now we must configure IOS so that NAT is denied for traffic through the VPN link and instead allowed for the rest. Here the config: Read the rest of this entry »
In this article the details of frame format is described. First you need to consider that the frames are different, there are different versions depending on which transport protocols and speeds of Ethernet. Analyze the IEEE 802.3 Ethernet frame and the Ethernet II Frame. (Developed by DIX).
IEEE 802.3 Ethernet is thus formed:
Pre | SFD | Destination | Source | Length/Type | Data/Filling | FCS
Pre: The preamble is a binary pattern of alternating zero and one, was used for Ethernet implementations of synch <= 10 Mbps Ethernet In new versions the preamble is not necessary but is maintained for compatibility. It consists of 7 octect.
SFD: Start of Frame Delimiter is a one octet field (1 byte) which marks the end of the preamble and then the timing information. Its bit pattern is 10101011.
Destination: It can be a unicast, multicast or broadcast. Read the rest of this entry »
A network is one that enables wireless connection of two or more computers together without cables involved. Here’s a guide to setting up a network wirelessly.
This article will show a series of 13 steps to connect a work station to a local area wireless network using the protocol Wi-Fi (Wireless Fidelity). Such networks offer us great advantages for home and companies, since they do not need to install cables.
Wi-Fi, was published under the IEEE 802.11 standard, it has been updates, which work at different speeds. The Wireless Local Area Networks allows highly mobile users, allowing them to minimize wiring, using technology of radio frequency.
Network Features
Step 1: Task Bar
Look for the network icon, located on the taskbar, there you know whether the machine has the power disconnected or not installed. Read the rest of this entry »
1. Hardware Aspects
A server is simply a computer system with hardware and special characteristics which are those that distinguish it from the home systems, the hardware support is more accurate and more complex configurations that allow better performance eg settings can accommodate 128 Microprocessors latest technology and multiple terabytes of RAM without being exaggerated at all these capabilities.
Other characteristics in terms of hardware, apart from its impressive capabilities to offer spectacular returns is what is known as hardware type “hotswap” or “hot swap” that allow us to replace damaged components without the need if you want to turn off the system to carry out maintenance.
2. Software Aspects
Besides all that need special hardware obviously developed software to control the hardware, use 100% and of course maintaining maximum stability. Read the rest of this entry »
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