Cisco enterprise architecture

Establishing a network performance baseline requires collecting key performance data from the ports and devices that are essential to network operation.1 Gather symptoms - Troubleshooting begins with the process of gathering and documenting symptoms from the network, end systems, and users. Stage 2 Isolate the problem - The problem is not truly isolated until a single problem, or a set of related problems, is identified.

66p mrdvad11 12-03-2013 170 55   Download

Static NAT – Mapping an unregistered IP address to a registered IP address on a one-to-one basis. Particularly useful when a device needs to be accessible from outside the network.Dynamic NAT – Maps an unregistered IP address to a registered IP address from a group of registered IP addresses. Dynamic NAT also establishes a one-to-one mapping between unregistered and registered IP address, but the mapping could vary depending on the registered address available in the pool, at the time of communication....

81p mrdvad11 12-03-2013 148 53   Download

The Data-over-Cable Service Interface Specification (DOCSIS)is an international standard developed by CableLabs, a non-profit research and development consortium for cable-related technologies. • DOCSIS specifies the OSI Layer 1 and Layer 2 requirements: Physical layer-For data signals that the cable operator can use, DOCSIS specifies the channel widths (bandwidths of each channel) as 200 kHz, 400 kHz, 800 kHz, 1.6 MHz, 3.2 MHz, and 6.4 MHz. DOCSIS also specifies modulation techniques (the way to use the RF signal to convey digital data).

47p mrdvad11 12-03-2013 136 54   Download

Limit network traffic to increase network performance. For example, if corporate policy does not allow video traffic on the network, ACLs that block video traffic could be configured and applied. This would greatly reduce the network load and increase network performance. 2. Provide traffic flow control. ACLs can restrict the delivery of routing updates. If updates are not required because of network conditions, bandwidth is preserved. 3. Provide a basic level of security for network access.

67p mrdvad11 12-03-2013 145 55   Download

The only system which is truly secure is one which is switched off and unplugged, locked in a titanium lined safe, buried in a concrete bunker, and is surrounded by nerve gas and very highly paid armed guards. Even then, I wouldn’t stake my life on it….An open security model is the easiest to implement . Simple passwords and server security become the foundation of this model. If encryption is used, it is implemented by individual users or on servers.

143p mrdvad11 12-03-2013 156 59   Download

Frame Relay has become the most widely used WAN technology in the world. Large enterprises, governments, ISPs, and small businesses use Frame Relay, primarily because of its price and flexibility. •Moreover, Frame Relay provides greater bandwidth, reliability, and resiliency than private or leased lines. •Frame Relay reduces network costs by using less equipment, less complexity, and an easier implementation.

57p mrdvad11 12-03-2013 116 52   Download

Computers make use of relatively short parallel connections between interior components, but use a serial bus to convert signals for most external communications.In a parallel connection, it is wrong to assume that the 8 bits leaving the sender at the same time arrive at the receiver at the same time. Rather, some of the bits get there later than others. This is known as clock skew.

65p mrdvad11 12-03-2013 102 50   Download

1.Connect devices that are separated by a broader geographical area. 2.Use the services of carriers, such as telephone companies, network providers… 3.Use serial connections.A VPN is an encrypted connection between private networks over a public network such as the Internet. Instead of using a dedicated Layer 2 connection such as a leased line, a VPN uses virtual connections called VPN tunnels, which are routed through the Internet from the private network of the company to the remote site or employee host.

39p mrdvad11 12-03-2013 109 51   Download

Describe how the Cisco enterprise architecture provides integrated services over an enterprise network. – Describe key WAN technology concepts. – Select the appropriate WAN technology to meet different enterprise business requirements.

45p 0984272663 25-04-2011 81 11   Download

Objectives In this chapter, you will learn to: Describe how the Cisco enterprise architecture provides integrated services over an enterprise network. Describe key WAN technology concepts. Select the appropriate WAN technology to meet different enterprise business requirements.

45p thanhtung_hk 05-11-2010 120 22   Download