Network Optimization Flashcards
QoS
Quality of Service
Categorize and prioritize traffic
Five Nines of Availability
Network is available 99.999% of the time
Max of 5 minutes downtime per year
Six Nines of Availability
Network is available 99.9999% of the time
Max of 30 seconds downtime per year
MTTR
Mean Time To Repair
MTBF
Mean Time Between Failures
SLA
Service Level Agreement
Types of Fault-Tolerant Network Design
Single point of failure
No single point of failure
NIC Redundancy
Found in strategic network hosts
Active-active
Active-standby
Active-Active
Both NICs are active with own MAC addresses
Active-Standby
Only one NIC active at a time. Client has single MAC and IP address
Computer Clustering
Set of computers that are connected and work together.
Clients view them as single system.
Layer 3 Redundancy
HSRP - Hot Standby Router Protocol
CARP - Common Address Redundancy Protocol
VRRP - Virtual Router Redundancy Protocol
GLBP - Gateway Load Balancing Protocol
LACP
Link Aggregation Control Protocol
Assign multiple physical links to a logical interface
Content Engine
aka Caching Engine
Network appliance that receives copy of contents and serves them to local clients. Reduces bandwidth burden.
Load Balancer
aka Content Switch
Request coming into server farm distributed across multiple servers
