Questions 1. What are link aggregation and multipath bonding? How are they simil
ID: 3759660 • Letter: Q
Question
Questions
1. What are link aggregation and multipath bonding? How are they similar? How are they different?
2. Describe the “building block” approach to high availability networks. If you can’t build a network from scratch this way, how can high availability be fit into an existing network?
3. Describe what VRRP or CARP do for a network.
4. What are the problems that can be encountered when attempting to back up a high-availability database? What kinds of solutions exist?
5. What does a enterprise directory server do? Why are they important for the configuration and management of services?
Explanation / Answer
3
>Virtual Router Redundancy Protocol, an election protocol that dynamically assigns responsibility for one or more virtual router(s) to the VRRP router(s) on a LAN, allowing several routers on a multiaccess link to utilize the same virtual IP address.
>A VRRP router is configured to run the VRRP protocol in conjunction with one or more other routers attached to a LAN.
>In a VRRP setup, one router is elected as the master router with the other routers acting as backups in case of the failure of the master router.
1
>Link aggregation is simply a means to bundle multiple ethernet connections between a pair of switches to share the load
>Link aggregation does not improve the throughput of a single I/O flow.
>A single flow will always traverse only one path.
>The benefit of link aggregation is seen when several unique flows exist, each from different source.
>Each individual flow will be sent down its own available NIC interface which is determined by a hash algorithm. Thus with more unique flows, more NICs will provide greater aggregate throughput. Link aggregation will not provide improved throughput for iSCSI, although it does provide a degree of redundancy.
>Bonding works between a server and switch. Numerous workstations using each using a single NIC connected to the switch will benefit from bonded connections between the switch and storage server.
5
>An enterprise directory is built on a very generic technology that can be used to hold data about virtually anything (e.g. photographs, postal addresses, and location maps). While directories can be used for a wide variety of functions, almost all deployments are based around core information relating to the staff of the enterprise.
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