Availability Concepts Flashcards Preview

CompTIA N10-007 Network+ > Availability Concepts > Flashcards

Flashcards in Availability Concepts Deck (5)
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1
Q

Fault tolerance

A
  • Maintain uptime in the case of a failure
    • If a problem occurs, what happens?
    • Can degrade performance
  • Fault tolerance adds complexity
    • The cost of managing the environment increases
  • Single device fault tolerance
    • RAID, redundant power supplies, redundant NICs
  • Multiple device fault tolerance
    • Server farms with load balancing
    • Multiple network paths
2
Q

Load balancing

A
  • Some servers are active, others are on standby

* If an active server fails, the passive server takes its place

3
Q

Redundancy and fault tolerance

A
  • Redundant hardware components
    • Multiple devices, load balancing power supplies
  • RAID
    • Redundant Array of Independent Disks
  • Uninterruptible power supplies (UPS)
    • Prepare for the disconnections
  • Clustering
    • A logical collective of servers
  • Load balancing
    • Shared service load across components
4
Q

High availability

A
  • Redundancy doesn’t always mean always available
    • May need to be enabled manually
  • HA (high availability)
    • Always on, always available

• May include many different components working
together
• Watch for single points of failure

• Higher availability almost always means higher costs
• There’s always another contingency you could add
• Upgraded power, high-quality server components,
etc.

5
Q

NIC teaming

A
  • Load Balancing / Fail Over (LBFO)
    • Aggregate bandwidth, redundant paths
    • Becomes more important in the virtual world
  • Multiple network adapters
    • Looks like a single adapter
    • Integrate with switches
  • NICs talk to each other
    • Usually multicast instead of broadcast
    • Fails over when a NIC doesn’t respond

Decks in CompTIA N10-007 Network+ Class (86):