Networking Concepts Flashcards

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CIDR Notation

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Classless Internet Domain Routing Notation; IP Subnet mask: leading bits of network / xx, then host bits

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Bit Counting

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Each Octet digit is a power of 2 yielding 1, 2, 4, 16, 64, 128

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VPC (Virtual Public Cloud) Summary

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Includes VPC, Regions, Public Subnet, Internet Gateway (IG), Egress Only (IG), Default Security Group, DHCP

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VPC Region

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Multiple regions per account; one trusted IP whitelist Account per Region; region has softmax 5 VPC per region; 1 default VPC per region

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VPC Characteristics

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Physical, isolated, redundant data centers, isolated private cloud; 1 default VPC per region, instant executable config; VPC belongs only to one region; soft max 5 VPCs per region

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Public Subnet

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1 default public subnet per AZ; Subdivides the VPC; Subnet in one AZ, in one region; Route table for many subnets in one VPC; Default subnet is public attached to outbound internet gateway; Public to private subnet by removing - destination 0.0.0.0/0 to internet gateway route

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Internet Gateway (IG)

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Controlled access to the public internet; provides the main route table; NAT to public IPV4 address instances

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Egress-only Internet Gateway

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IPv6 Controlled access to the public internet; enable outbound communication over IPv6; prevents outside initiating an IPv6 connection to your instance

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Default Security Group

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Instance level firewall; managed through IAM; Default no traffic passed from IG or NAT; Default VPC Security Group called default

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DHCP

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DNS Settings resolution; automatically provides and assigns server IP addresses; DNS, Domain Name, NTP Time Server