Network Operations - Objective 3 Flashcards
Network availability (statistics & sensors), organizational documents & policies, high availability, disaster recovery
FHRP
First hop router redundancy protocol
Uses hot standby router protocol (HSRP) to create virtual IP and MAC addresses to provide active and standby routers
MIB
Management Information Base
The structure of the management data of a device subsystem using a hierarchal namespace
containing the object identifier (OID) as well as other information
SNMP Agents
Network devices sending information about themselves to the SNMP manager, usually by using a background service
3 types of SNMP messages
- Set
- Get
- Trap
SNMP set messages
- Manager requests an agent change the value of a variable or a list of variables
- Agent sends back a list of all the new values
SNMP get request
A manager to agent request to retrieve the value of a variable or a list of variables.
SNMP trap message
Notifications, usually event or alarm, from the agent to the manager
2 ways to encode data inside SNMP trap messages
- granular (just the update)
- verbose (the whole story)
How SNMP trap data is sent & stored
key value pair configuration a.k.a pair binding
e.g.
Criticality: High
Severity: Low
3 Improvements of SNMPv3 over 1 & 2
CIA
- (DES 56-bit, 3DES, & AES)
- It groups SNMP components into different entities which can be given different authorizations & access privileges (read, write, read-write)
The 3 competing tensions in network design
Time, cost, & quality
3 levels into which security policies are organized
- Organizational
- System-specific
- Issue-specific
Standard
Implements a policy in an organization
MIB
Management Information Base
A standard database used for network monitoring
- MIB-II is most common
Difference between HSRP & VRRP
HSRP is Cisco proprietary and allows for only one standby router.
VRRP is open-standard and allows for multiple standby routers.
