How networks actually work, from the wire to the TLS handshake: the OSI and TCP/IP models, IP addressing and subnetting arithmetic, DNS records and resolution, TCP and UDP behaviour, the HTTP versions, and certificates. Vendor-neutral and precise.
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Prefix lengths, masks, host counts and block boundaries — with the arithmetic done exactly, plus the reserved ranges worth recognising on sight.
48 total questions
Card #1
What does the /24 in 192.168.1.0/24 mean?
Card #2
How do you compute the usable host count for an IPv4 prefix?
Card #3
The three private IPv4 ranges (RFC 1918)
1. How many usable host addresses does a /26 provide?
2. The address 192.168.10.77/27 belongs to which network?
3. The broadcast address of 172.16.5.128/25 is:
1. The usable host count of an IPv4 subnet is 2^(32 - prefix) minus ___.
Hint: The network and broadcast addresses
2. A /26 subnet has ___ usable host addresses.
Hint: 64 total, less two
3. The dotted-decimal mask for a /27 is 255.255.255.___.
Hint: 256 minus the block size of 32
