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Computer Networks → Introduction to Computer Networks 38

RTO is
Maximum acceptable downtime after disaster
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RPO is
Maximum acceptable data loss measured in time
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CMDB stores
IT asset configurations and their relationships
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Change management in IT ensures changes are
Made in controlled manner minimizing risk and disruption
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CAB stands for
Change Advisory Board
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Quantum key distribution uses
Quantum mechanics to distribute keys securely
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Post-quantum cryptography provides
Algorithms resistant to quantum computer attacks
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Network digital twin is
Virtual replica for simulation and testing before changes
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AIOps is
AI-driven IT operations for monitoring and remediation
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Edge computing processes data
At network edge near data source reducing latency
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Fog computing is
Extension of cloud computing to edge and network devices
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Network slicing creates
Multiple virtual networks on shared physical infrastructure
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Intent-based networking translates
Business intent to network configuration automatically
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Autonomous networking uses
AI/ML for self-managing zero-touch operations
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6G will provide beyond 5G
Terahertz frequencies AI-native sub-0.1ms Tbps capabilities
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IEEE 802.3 is for
Wired Ethernet
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IEEE 802.15 is for
WPAN Bluetooth and Zigbee
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IEEE 802.16 is for
WiMAX
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IEEE 802.1Q defines
VLAN tagging
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IEEE 802.1D defines
Spanning Tree Protocol
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IEEE 802.1w is
Rapid Spanning Tree Protocol
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IEEE 802.3ad is
Link Aggregation EtherChannel
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IEEE 802.3af PoE provides
15.4W maximum
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IEEE 802.3at PoE+ provides
25.5W maximum
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IEEE 802.3bt PoE++ provides
90W maximum
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LDAP port is
389
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Kerberos port is
88
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LDAPS port is
636
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SSH port is
22
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RDP port is
3389
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MySQL default port is
3306
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PostgreSQL default port is
5432
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NTP port is
123
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In-band management uses
Production network for device management
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Out-of-band management uses
Separate network not in production path for device access
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Console port provides access when
Network interface is down or device is unresponsive
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TACACS+ encrypts
Entire payload
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RADIUS encrypts
Only the password field
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Computer Networks → Transport Layer 1

SNMP port numbers are
161 and 162
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Computer Networks → HTTP and HTTPS 1

HTTPS alternate port commonly used is
8443
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