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Computer Networks → Introduction to Computer Networks 32

NB-IoT operates over
Licensed cellular LTE spectrum
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RPL in IoT networking stands for
Routing Protocol for Low-power and Lossy networks
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Thread protocol is used for
IPv6-based mesh for IoT home automation
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Ansible uses which approach
Agentless SSH and API
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YANG stands for
Yet Another Next Generation data modeling language
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gNMI stands for
gRPC Network Management Interface
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NETCONF uses data format
XML
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Streaming telemetry model is
Push model from device to collector
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IaC stands for
Infrastructure as Code
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GitOps means
Using Git as source of truth for infrastructure configuration
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Ansible playbook format is
YAML
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Idempotent in automation means
Running same operation multiple times produces same result
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pyATS stands for
Python Automated Test System (Cisco)
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Three pillars of observability are
Metrics Logs and Traces
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Prometheus is used for
Time-series metrics collection and monitoring
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Grafana is used for
Visualization and dashboards for metrics
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ELK stack stands for
Elasticsearch Logstash Kibana
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BFD stands for
Bidirectional Forwarding Detection
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MTBF stands for
Mean Time Between Failures
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MTTR stands for
Mean Time To Recovery
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Five nines availability means downtime of
~5 min/year
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Active-active HA means
Both nodes simultaneously active and handling traffic
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HSRP is
Cisco proprietary first-hop redundancy protocol
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VRRP is
IEEE standard first-hop redundancy protocol RFC 5798
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GLBP adds what over HSRP and VRRP
Load balancing across multiple active gateways
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NSF stands for
Non-Stop Forwarding
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GRE tunneling encapsulates
Any network layer packet in GRE and IP header
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EIGRP DUAL stands for
Diffusing Update Algorithm
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EIGRP feasible successor is
Loop-free backup route
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HTTP/2 head-of-line blocking still exists at
TCP level
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HTTP/3 solves HoL blocking because QUIC uses
Independent streams over UDP
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SRTP stands for
Secure Real-Time Transport Protocol
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Computer Networks → Types of Networks 1

6LoWPAN stands for
IPv6 over Low-power Wireless Personal Area Networks
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Computer Networks → Wireless Networks 1

Bluetooth frequency range is
2.4 GHz ISM band
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Computer Networks → Network Layer 1

NAT overloading is also called
PAT Port Address Translation
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Computer Networks → Subnetting 1

VLSM stands for
Variable Length Subnet Masking
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Computer Networks → Routing Algorithms 2

OSPF reference bandwidth default is
100 Mbps
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OSPF cost formula is
Reference bandwidth divided by interface bandwidth
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Computer Networks → Transport Layer 1

WebSocket provides
Full-duplex persistent connection via HTTP upgrade
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Computer Networks → Presentation Layer 1

DTLS stands for
Datagram TLS providing TLS security over UDP
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