Section 17: Network Availability

Question 1

What is Network Availability?

Answer 1

Measure of how well a computer network can respond to connectivity and performance demands that are placed upon it

Question 2

What is the Mean Time to Repair (MTTR)?

Answer 2

Measures the average time it takes to repair a network device when it breaks

Question 3

What is the Mean Time Between Failures (MTBF)?

Answer 3

Measures the average time between failures of a device

Question 4

What is Hardware Redundancy?

Answer 4

Devices with two network interface cards (NICs), hard drives, or internal power supplies

Question 5

What would be considered Active-Active?

Answer 5

Multiple NICs are active at the same time. Makes troubleshooting complex

Question 6

What would be considered Active-Passive?

Answer 6

One NIC is active at a time.

Question 7

What types of hardware could be redundant?

Answer 7

Routers, Switches, Firewalls, and Servers

Question 8

What is Network Interface Card (NIC) Teaming?

Answer 8

Using a group of network interface cards for load balancing and failover on a server or other device.

Question 9

What is the Virtual Router Redundancy Protocol (VRRP)?

Answer 9

The Interactive Electronic Technical Publications (IETP) open-standard variant of the Hot Standby Router Protocol (HSRP). Creates a virtual router as a default gateway

Question 10

What is First-Hop Redundancy Protocol (FHRP)?

Answer 10

Hot Standby Router Protocol (HSRP) uses virtual IP and MAC addresses to provide an “active router” and a “standby router”.

Question 11

What is Multipathing?

Answer 11

Creates more than one physical path between the server and its storage devices for better fault tolerance and performance

Question 12

What is a Cold Site?

Answer 12

An available building that does not have any hardware or software in place or configured. Recovery is slow and time-consuming

Question 13

What is a Warm Site?

Answer 13

An available building that already contains a lot of the equipment. Recovery time is between 24 hours to 7 days.

Question 14

What is a Hot Site?

Answer 14

An available building that already has the equipment and data in place and configured. Minimal downtime

Question 15

What is a Cloud Site?

Answer 15

Allows for the creation of a recovery version of an organization’s enterprise network in the cloud.

Question 16

What is a Recovery Time Objective (RTO)?

Answer 16

Time and service level within which a business process must be restored after a disaster to avoid unacceptable consequences. Use either hot or cloud site.

Question 17

What is a recovery Point Objective (RPO)?

Answer 17

Interval of time during a disruption before data lost exceeds the BCP’s maximum allowable threshold or tolerance

Question 18

What is an Uninterruptible Power Supply (UPS)?

Answer 18

Provides emergency power to a load when the input power source or main power fails

Question 19

What is a Power Distribution Unit (PDU)?

Answer 19

Distributes electric power, especially to racks of computers and networking equipment located within a data center.

Question 20

What is a Generator?

Answer 20

Provides log-term power during a power outage in a region

Question 21

What is the Quality of Service (QoS)?

Answer 21

Enables strategic optimization of network performance for different types of traffic.

Question 22

What is the Categorization of Traffic?

Answer 22

Determine network performance requirements for various traffic types (voice, video, delay)

Question 23

What are some ways to categorize traffic?

Answer 23

• Classification
• Marking
• Congestion Avoidance
• Congestion Management
• Policing and Shaping
• Link Efficiency