Network Operations (Chapter 3) Flashcards
Network Diagram
A physical and/or logical visual map of placement and relationships of network devices on OSI layer 1,2 or 3
Logical network diagram
A visual map that is used to trace/troubleshoot the flow of data usually based in layer OSI layer 2 and/or 3
Physical Network Diagram
Is a visual map of where the physical network devices are located in a building
Rack diagram
Is a type of physical diagram that displays the equipment within a server rack
Cable Maps
Port Location Diagram
- is a visual map that shows exactly where network cabling terminates at bothe ends
Port Map
- correlates the cable numbers and drop labels to patch panel port numbers
Wireless Site Survey
Is the process of evaluation a location for optimized wireless network coverage, performance and capacity.
WiFi Coverage Heat Map
Is a visual representation of the WiFi signal strength and coverage
Asset inventory
Is the process of identifying, documenting and maintaining a comprehensive list of an organisations physical and digital assets to track and manage resources effectively
Service Level Agreement
Is an agreement between the buy and the vendor for the uptime/available for support of a product
IP address Management (IPAM)
Is a framework for managing and monitoring an organisation IP address space used to track the IP allocation, usages and availablity across the network
Life cycle Management
Is the process of managing IT system applications from provisioning to retirement
Baseline let metrics
Bandwidth Utilisation
Latency
Packet loss rate
Network throughput
Error rates
Device Resource Usage
Protocol usage
SNMP
Is protocol used to monitor devices on a network by providing a common mechanism for network devices to relay management information from the devices Management Information Base (MIB)
SNMP Components
Managed device
- are devices on a network that are being monitored
Agents
- the software installed on the managed devices that responds to NMS
Network Management System
- a centralizes system that had software installed to monitor all the devices on the network
SNMP community string
Is a form of identification used by both manager and agent that is used to authenticate eachother
2 type community strings
Public
- for read-only queries
Private
- for read/write communication
Syslog
Is a protocol used to send/receive system logs or events messages of devices on a network to a centralised Syslog server.
Uses UDP 514
Packet captured
Is the process of intercepting and inspecting network traffic as it passes through a network interface
Port Mirroring
Is the process of capturing and monitoring port traffic on a switch, by copying the traffic from one port to another
Flow Data
Is a summary (metadata) of network activity that is generated by network devices
Security Information and Event Management (SIEM)
Is single software solution that can receive network analysis (SNMP, Syslog,ect) that can be used to analyse the network in greater details
Stateless Address Auto configuration (SLAAC)
Is the mechanism used by devices to request an IPv6 address.
1) devices transmits a multicast Router Solicitation (RS) to find the Gateway
2) Router responds with Router Advertisement (RA) that contains the subnet ID
3) devices accepts it’s Host ID to complete it’s IPv6 address
Host File
Is a text file that contains name to IP address mappings, It is always checked first before a DNS sever is queried
DNS Records
Is a database entry that maps domain names to corresponding information (IP address, mail server, ect)
DNS namespace
Is the entire DNS Hierarchical tree structure
Zone
A segment of the entire DNS namespace
Zone file
Is a text file that contains all the records for the zone
Zone transfer
A Replication of a zone file from one DNS sever to another
Start of Authority (SOA)
The original DNS sever that was used to create the Zone
Authoritative DNS sever
Any DNS sever that has a copy of the zone file
Master DNS sever
Is an authoritative DNS sever with a writeable copy of the zone file
Slave DNS sever
An authoritative DNS sever with a read-only copy of the zone file
Caching-only DNS sever
Is a DNS sever that performs lookups for clients,
DNS Reolver
The DNS sever/client that performs a DNS lookup
Recursive Query
A query where the DNS sever takes full responsibility for resolving the domain name and returns the final answer back to the client
Iterative Query
A query where the resolver starts at the top of the DNS namespace and is referred at each level down to the next level until the authoritative sever is found
Zone Types
Forward Zone
- Maps Names to IP address
- forward lookup is used is you know the name but not the IP Address
Reverse Lookup
- Maps IP Address to names
- Reverse lookups is used when you know the IP address but not the name
