3.0 Network Operations
Last updated
Last updated
Device/chassis
Network Metrics
Bandwidth: The measure of how many bits the network can transmit in 1-second (bps)
Simple Network Management Protocol (SNMP) [Port 161 & 162] is a networking protocol used for the management and monitoring of network connected devices in IP networks
A trap is an asynchronous notification from the agent to the manager - sent by the agent to notify the management of an event that is occurring, such as an alarming condition
Granular Trap: Contains a unique object identifier (OID) number and a value for that OID
Verbose Trap: Contain all the information about a given alert or event as its payload
Object Identifier (OIDs): Identifies a variable that can be read or set in the SNMP protocol
Management Information Bases (MIBs): Translation file that is used to describe the structure of the management data of a device subsystem using a hierarchical namespace containing object identifiers (OIDs)
Service Level Agreement (SLA): Commitment between a service provider and a client, where the quality, availability, and responsibilities are agreed upon
Non-Disclosure Agreement (NDA): Agreement between two parties that define what data is considered confidential and cannot be shared outside of that relationship
Acceptable Use Policy (AUP): Set of rules applied by the owner of a network or service that provides restrictions and guidelines for use cases
Memorandum of Understanding (MOU): Non-binding agreement between two or more organizations to detail what common actions they intend to take
Firewall: Network security appliance at the boundary of the network
Can be software or hardware
Stateful: Allows traffic that originates from inside the network to go out to the Internet and blocks traffic originating from the Internet from getting into the network
Next-Generation Firewall (NGFW): Enhanced version of a firewall
Conducts deep packet inspection at Layer 7
Detects and prevents attacks
Much more powerful than basic stateless or stateful firewalls
Continually connects to cloud resources for latest threat information
First-Hop Redundancy Protocol (FHRP): Uses virtual IP and MAC addresses to provide an "active router" and a "standby router" for redundancy - if the active is offline, the standby answers
Hot Standby Router Protocol (HSRP) is a Cisco Proprietary FHRP that uses a large set of routers known as a standby group to present the illusion of a single virtual router to a host
Gateway Load Balancing Protocol (GLBP) --> Cisco-proprietary protocol
Virtual Router Redundancy Protocol (VRRP) --> Open-source protocol
Common Address Redundancy Protocol (CARP) --> Open-source protocol
Business Concepts:
Mean time to repair (MTTR): Average time it takes to repair a broken device
Mean time between failure (MTBF): Average time between failures on a device
Recovery time objective (RTO): Duration of time and a service level within which a business process must be restored after a disaster to avoid consequence --> Acceptable downtime
Recovery point objective (RPO): The maximum amount of data, as measured in time, that an organization is willing to lose during an outage --> Acceptable data loss