IP Addressing & Subnetting interview questions

1. A.a 128-bit address written as eight groups of hexadecimal digits separated by colons
2. B.the IPv4 range reserved for one-to-many delivery to subscribing hosts
3. C.a 32-bit address written as four dotted decimal octets, e.g. 192.168.1.10
4. D.a mask of 255.255.255.192 giving 4 subnets of 62 usable hosts each

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1. A.IPv6 address
2. B.IPv4 address
3. C.CIDR /24 prefix
4. D.Private RFC 1918 ranges

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1. A.IPv4 address — private IPv6 addresses analogous to RFC 1918, not routed on the public Internet
2. B.IPv4 address — a 32-bit address written as four dotted decimal octets, e.g. 192.168.1.10
3. C.IPv4 address — a value that separates the network portion of an IP from the host portion
4. D.IPv4 address — a mask of 255.255.255.252 giving 4 addresses and 2 usable hosts, ideal for point-to-point links

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1. A.private IPv6 addresses analogous to RFC 1918, not routed on the public Internet
2. B.a 128-bit address written as eight groups of hexadecimal digits separated by colons
3. C.a 32-bit address written as four dotted decimal octets, e.g. 192.168.1.10
4. D.combining contiguous subnets into a single larger prefix to shrink routing tables

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1. A.Network address
2. B.IPv6 address
3. C.CIDR /25 prefix
4. D.Multicast 224.0.0.0/4

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1. A.IPv6 address — 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 reserved for private networks
2. B.IPv6 address — a mask of 255.255.255.128 splitting a /24 into two subnets of 126 usable hosts each
3. C.IPv6 address — a 128-bit address written as eight groups of hexadecimal digits separated by colons
4. D.IPv6 address — a 32-bit address written as four dotted decimal octets, e.g. 192.168.1.10

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1. A.2^(32 minus prefix) minus 2, subtracting the network and broadcast addresses
2. B.a subnet mask of 255.255.255.0 providing 256 addresses (254 usable hosts)
3. C.addresses valid only on a single link, used for neighbor discovery
4. D.running IPv4 and IPv6 simultaneously on the same hosts and network

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1. A.CIDR /8 prefix
2. B.Dual stack
3. C.APIPA / link-local 169.254.0.0/16
4. D.CIDR /24 prefix

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1. A.CIDR /24 prefix — the IPv4 range reserved for one-to-many delivery to subscribing hosts
2. B.CIDR /24 prefix — a subnet mask of 255.255.255.0 providing 256 addresses (254 usable hosts)
3. C.CIDR /24 prefix — the first address in a subnet identifying the subnet itself, with all host bits zero
4. D.CIDR /24 prefix — a value that separates the network portion of an IP from the host portion

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1. A.subdividing a network into subnets of different sizes to conserve address space
2. B.2^(32 minus prefix) minus 2, subtracting the network and broadcast addresses
3. C.a mask of 255.0.0.0 providing roughly 16.7 million addresses
4. D.10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 reserved for private networks

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1. A.Private RFC 1918 ranges
2. B.IPv6 unique local fc00::/7
3. C.APIPA / link-local 169.254.0.0/16
4. D.Dual stack

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1. A.Private RFC 1918 ranges — 2^(32 minus prefix) minus 2, subtracting the network and broadcast addresses
2. B.Private RFC 1918 ranges — a 32-bit address written as four dotted decimal octets, e.g. 192.168.1.10
3. C.Private RFC 1918 ranges — 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 reserved for private networks
4. D.Private RFC 1918 ranges — the last address in a subnet, used to reach all hosts on that subnet

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1. A.a mask of 255.255.255.192 giving 4 subnets of 62 usable hosts each
2. B.the IPv4 range reserved for one-to-many delivery to subscribing hosts
3. C.127.0.0.1, which refers to the local host itself
4. D.a mask of 255.0.0.0 providing roughly 16.7 million addresses

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1. A.CIDR /16 prefix
2. B.Loopback address
3. C.Broadcast address
4. D.Dual stack

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1. A.Loopback address — 2^(32 minus prefix) minus 2, subtracting the network and broadcast addresses
2. B.Loopback address — a mask of 255.0.0.0 providing roughly 16.7 million addresses
3. C.Loopback address — 127.0.0.1, which refers to the local host itself
4. D.Loopback address — subdividing a network into subnets of different sizes to conserve address space

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1. A.the router IP a host uses to reach destinations outside its own subnet
2. B.a mask of 255.0.0.0 providing roughly 16.7 million addresses
3. C.10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 reserved for private networks
4. D.the IPv4 range reserved for one-to-many delivery to subscribing hosts

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1. A.Default gateway
2. B.IPv6 address
3. C.IPv4 address
4. D.Dual stack

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1. A.Default gateway — the IPv4 range reserved for one-to-many delivery to subscribing hosts
2. B.Default gateway — Stateless Address Autoconfiguration where hosts derive addresses from router advertisements
3. C.Default gateway — the router IP a host uses to reach destinations outside its own subnet
4. D.Default gateway — combining contiguous subnets into a single larger prefix to shrink routing tables

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1. A.a value that separates the network portion of an IP from the host portion
2. B.the IPv4 range reserved for one-to-many delivery to subscribing hosts
3. C.a mask of 255.255.255.128 splitting a /24 into two subnets of 126 usable hosts each
4. D.combining contiguous subnets into a single larger prefix to shrink routing tables

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1. A.Subnet mask
2. B.Usable hosts formula
3. C.CIDR /8 prefix
4. D.Broadcast address

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1. A.Subnet mask — a mask of 255.255.0.0 providing 65,536 addresses
2. B.Subnet mask — combining contiguous subnets into a single larger prefix to shrink routing tables
3. C.Subnet mask — a value that separates the network portion of an IP from the host portion
4. D.Subnet mask — a mask of 255.255.255.192 giving 4 subnets of 62 usable hosts each

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1. A.an address identifying a single unique interface for one-to-one delivery
2. B.the last address in a subnet, used to reach all hosts on that subnet
3. C.private IPv6 addresses analogous to RFC 1918, not routed on the public Internet
4. D.2^(32 minus prefix) minus 2, subtracting the network and broadcast addresses

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1. A.Broadcast address
2. B.Multicast 224.0.0.0/4
3. C.Private RFC 1918 ranges
4. D.Usable hosts formula

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1. A.Broadcast address — the last address in a subnet, used to reach all hosts on that subnet
2. B.Broadcast address — a mask of 255.255.255.192 giving 4 subnets of 62 usable hosts each
3. C.Broadcast address — a 32-bit address written as four dotted decimal octets, e.g. 192.168.1.10
4. D.Broadcast address — addresses valid only on a single link, used for neighbor discovery

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1. A.subdividing a network into subnets of different sizes to conserve address space
2. B.127.0.0.1, which refers to the local host itself
3. C.a mask of 255.255.255.252 giving 4 addresses and 2 usable hosts, ideal for point-to-point links
4. D.Stateless Address Autoconfiguration where hosts derive addresses from router advertisements

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1. A.IPv6 link-local fe80::/10
2. B.CIDR /30 prefix
3. C.CIDR /26 prefix
4. D.Variable Length Subnet Masking (VLSM)

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1. A.CIDR /30 prefix — running IPv4 and IPv6 simultaneously on the same hosts and network
2. B.CIDR /30 prefix — the router IP a host uses to reach destinations outside its own subnet
3. C.CIDR /30 prefix — a mask of 255.255.255.252 giving 4 addresses and 2 usable hosts, ideal for point-to-point links
4. D.CIDR /30 prefix — a value that separates the network portion of an IP from the host portion

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1. A.a mask of 255.255.255.252 giving 4 addresses and 2 usable hosts, ideal for point-to-point links
2. B.running IPv4 and IPv6 simultaneously on the same hosts and network
3. C.addresses a host self-assigns when no DHCP server responds
4. D.10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 reserved for private networks

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1. A.CIDR /16 prefix
2. B.Network address
3. C.APIPA / link-local 169.254.0.0/16
4. D.CIDR /8 prefix

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1. A.APIPA / link-local 169.254.0.0/16 — a value that separates the network portion of an IP from the host portion
2. B.APIPA / link-local 169.254.0.0/16 — running IPv4 and IPv6 simultaneously on the same hosts and network
3. C.APIPA / link-local 169.254.0.0/16 — addresses a host self-assigns when no DHCP server responds
4. D.APIPA / link-local 169.254.0.0/16 — 127.0.0.1, which refers to the local host itself

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