High availability and disaster recovery concepts

Question 1

What is load balancing?

Answer 1

Load balancing is the process of distributing network or application traffic across multiple servers to ensure no single server becomes overwhelmed, improving performance and reliability.

Question 2

What is multipathing?

Answer 2

Multipathing is a technique that allows for multiple physical paths to data storage, providing redundancy and increased performance.

Question 3

What is network interface card (NIC) teaming?

Answer 3

Network interface card (NIC) teaming is the practice of combining multiple NICs into a single logical interface to increase bandwidth and provide failover capabilities.

Question 4

What is redundant hardware/clusters for switches?

Answer 4

Redundant hardware/clusters for switches involves having multiple switches in a network to ensure continuous operation even if one switch fails.

Question 5

What is redundant hardware/clusters for routers?

Answer 5

Redundant hardware/clusters for routers means having backup routers in place to take over if the primary router fails.

Question 6

What is redundant hardware/clusters for firewalls?

Answer 6

Redundant hardware/clusters for firewalls involve having multiple firewalls to maintain security if one fails.

Question 7

What is an uninterruptible power supply (UPS)?

Answer 7

An uninterruptible power supply (UPS) provides emergency power to a network device in case of a power outage, ensuring continuous operation until backup generators kick in.

Question 8

What are power distribution units (PDUs)?

Answer 8

Power distribution units (PDUs) distribute electrical power to network devices within a rack, ensuring efficient power management and redundancy.

Question 9

What is a generator’s role in facilities and infrastructure support?

Answer 9

A generator provides backup power during extended power outages, ensuring that network infrastructure remains operational.

Question 10

What is HVAC in facilities and infrastructure support?

Answer 10

HVAC (Heating, Ventilation, and Air Conditioning) systems maintain optimal temperature and humidity levels for network equipment, preventing overheating and damage.

Question 11

What is fire suppression in facilities and infrastructure support?

Answer 11

Fire suppression systems detect and extinguish fires in network facilities, protecting equipment and data.

Question 12

What is a cold site?

Answer 12

A cold site is a backup site equipped with power and environmental controls but without active hardware or data until needed.

Question 13

What is a warm site?

Answer 13

A warm site is a backup site with some active hardware and data, ready to become operational more quickly than a cold site.

Question 14

What is a hot site?

Answer 14

A hot site is a fully operational backup site with real-time data replication, ready to take over immediately in case of a disaster.

Question 15

What is a cloud site in redundancy and high availability?

Answer 15

A cloud site in redundancy and high availability refers to using cloud services as a backup or alternative to on-premises infrastructure.

Question 16

What is the difference between active-active and active-passive configurations?

Answer 16

Active-active configurations have multiple active systems simultaneously sharing the load, while active-passive configurations have one active system and one or more standby systems.

Question 17

Why is having multiple Internet service providers (ISPs) and diverse paths important?

Answer 17

Having multiple Internet service providers (ISPs) and diverse paths ensures continuous connectivity even if one ISP or path fails.

Question 18

What is Virtual Router Redundancy Protocol (VRRP)?

Answer 18

Virtual Router Redundancy Protocol (VRRP) is a protocol that allows multiple routers to share a virtual IP address, providing redundancy.

Question 19

What is First Hop Redundancy Protocol (FHRP)?

Answer 19

First Hop Redundancy Protocol (FHRP) includes protocols like VRRP and HSRP, providing failover capabilities for default gateway routers.

Question 20

What is mean time to repair (MTTR)?

Answer 20

Mean time to repair (MTTR) is the average time required to repair a failed component and restore it to operational status.

Question 21

What is mean time between failure (MTBF)?

Answer 21

Mean time between failure (MTBF) is the average time between failures of a system or component, indicating reliability.

Question 22

What is recovery time objective (RTO)?

Answer 22

Recovery time objective (RTO) is the maximum acceptable amount of time to restore a system or service after a failure.

Question 23

What is recovery point objective (RPO)?

Answer 23

Recovery point objective (RPO) is the maximum acceptable amount of data loss measured in time, indicating the point to which data must be restored.

Question 24

What are the concepts of network device backup/restore?

Answer 24

Network device backup/restore involves creating copies of device configurations and states to restore in case of failure or disaster.

Question 25

What is meant by the state in network device backup/restore?

Answer 25

The state in network device backup/restore refers to the current status and running conditions of a device, including its settings and processes.

Question 26

What is configuration in network device backup/restore?

Answer 26

Configuration in network device backup/restore involves the specific settings and parameters that define how a network device operates, which can be restored from a backup.