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Question 1

What are some examples of Fault Tolerance?

Answer 1

RAID

UPS

Clustering

Load balancing

Any redundant hardware components or network paths

Question 2

What does “High Availability” mean?

Answer 2

Automatic fault tolerance such that there is essentially zero down time.

Question 3

What is NIC Teaming?

Answer 3

• Multiple network adapters combined in software to work as a single adapter.
• Used particularly in virtualization / SDN.
• Aggregates bandwidth and provides redundant paths.
• NICs communicate with each other to fail over when a NIC doesn’t respond.
• LBFO: Load Balancing / Fail Over.

Question 4

What is Port Aggregation?

Answer 4

Using multiple interfaces as a single port, which provides redundancy. If used across multiple switches, it provides fault tolerance.

Question 5

What is a Cold Site?

Answer 5

A recovery site.

• Has no hardware, no data, and no people.
• Just an empty location that you would need to bring everything to if the main site went down.

Question 6

What is a Warm Site?

Answer 6

A recovery site that functions somewhere between a cold site and a hot site.

• May have some hardware ready and waiting, but you would need to bring the data.
• Or, it may just have empty rack space, and you’d also need to bring hardware.

Question 7

What is a Hot Site?

Answer 7

A type of recovery site that is an exact (or, at least sufficient) replica of your main site.

• Has all necessary hardware. You buy two of everything, one for the main site and one for the hot site.
• Applications, software, and data are constantly updated via automated replication from the main site.

Question 8

What is MTTR?

Answer 8

Mean Time to Restore (or, Repair)

Question 9

What is MTBF?

Answer 9

Mean Time Between Failures

Question 10

What is an SLA?

Answer 10

Service Level Agreement

• Contractual recovery expectations. If there is an outage, it must be restored within a certain time.
• May include penalties for not meeting certain service levels.