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Section 13

QuestionAnswer
Occurs with virtual gateways and is used if the router goes down. Layer 3 Redundancy
Takes many forms. This may also be devices with two NICS, hard drives or internal power supplies. Hardware Redundancy
First hop redundancy by Cisco which allows for active router and standby router and creates virtual router as the default gateway/ Hot Standby Router Protocol (HSRP)
Open standard variant pf HSRP which allows for active router and standby router and creates router as default gateway.. Common Address Redundancy Protocol (CARP)
Dedicated appliances that perform the caching functions of a proxy server. Content Engine
Distributes incoming requests across the various servers in a server farm. Content Switches
Allows for active and standby router and creates router as the default gateway. Virtual Router Redundancy Protocol (VRRP)
Achieves redundancy by having multiple links between devices. Link Aggregation Control Protocol (LACP)
First hop redundancy protocol for cisco that focuses on load balancing over redundancy. Gateway Load Balancing Protocol (GLBP)
In addition to hardware and redundancy you sometimes need site redundancy. Recovery Sites
Building is available but may not have any hardware in place. Cold Sites
Building and equipment are available. Software isn't installed. Recovery is fairly quick. Warm Sites
Building and equipment are all set and ready. Hot Sites
Complete backup is the most safe but costly. Full
Backup has changed since last backup. Incremental
Measures average time it takes between failures of a device. Mean time between failures (MTBF)
Measures average time it takes to repair a network device when it breaks. Mean time to repair (MTTR)
Created by: Andrea Allen
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