Interview Q&A / Computer Networks
Computer Networks interview questions
What happens when you open a website, TCP vs UDP, DNS and HTTP.
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- What is an IP address, a subnet and CIDR notation like /24?
An IPv4 address is a 32-bit number that identifies a device on a network. CIDR notation such as 192.168.1.0/24 says how many leading bits are the network part; the rest identify hosts. A /24 has 256 addresses (254 usable), a /16 has 65,536, and each extra bit halves the size of the subnet.
IntermediateIn-depth4 min read - What is VLSM? Allocate subnets for 100, 50 and 20 hosts from 192.168.5.0/24.
VLSM (variable length subnet masking) lets each subnet use the mask that fits its size instead of one size for all. Allocate largest first: /25 for 100 hosts, /26 for 50, /27 for 20, and a /30 for a router link.
IntermediateQuick answer1 min read