FAQ-IPV4# INTERVIEW PREP GUIDE ABOUT IPV4
'Practical term used in professional training'
🔹 What is Internet Address Version 4 (IPv4) ?
Pv4 is the fourth version of the Internet Protocol used to identify devices on a network and route data across the internet.
🔹 What does IPv4 stand for ?
Internet Protocol version 4.
🔹 How long is an IPv4 address ?
An IPv4 address is 32 bits long.
🔹 How is an IPv4 address written ?
It is written in dotted-decimal format (e.g., 192.168.1.1).
🔹 How many IPv4 addresses are possible ?
Approximately 4.3 billion.
🔹 Who developed IPv4 ?
IPv4 was developed by DARPA in the early 1980s.
🔹 When was IPv4 introduced ?
IPv4 was officially deployed in 1983.
🔹 What is the structure of an IPv4 address ?
It consists of four octets separated by dots.
🔹 What is an octet ?
An 8-bit section of an IPv4 address.
🔹 What is the range of each octet ?
0 to 255.
🔹 What are IP address classes ?
IPv4 originally had five classes: A, B, C, D, and E.
🔹 What is a Class A address range ?
1.0.0.0 to 126.255.255.255.
🔹 What is a Class B address range ?
128.0.0.0 to 191.255.255.255.
🔹 What is a Class C address range ?
192.0.0.0 to 223.255.255.255.
🔹 What is a Class D address range ?
Multicasting.
🔹 What is a Class E address range ?
Experimental purposes.
🔹 What is a public IP address ?
An IP address accessible over the internet
🔹 What is a private IP address ?
An IP address reserved for internal networks.
🔹 What are the private IPv4 address ranges ?
10.0.0.0/8, 172.16.0.0–172.31.255.255, and 192.168.0.0/16
🔹 What is a loopback address ?
127.0.0.1, used to test the local machine.
🔹 What is a subnet mask ?
A number that defines the network and host portions of an IP address.
🔹 What is CIDR ?
Classless Inter-Domain Routing, a method for allocating IP addresses efficiently.
🔹 What does /24 mean in CIDR notation ?
It means 24 bits are used for the network portion.
🔹 What is subnetting ?
Dividing a network into smaller networks.
🔹 What is supernetting ?
Combining smaller networks into a larger one.
🔹 What is ARP ?
Address Resolution Protocol; it maps IP addresses to MAC addresses.
🔹 What is ICMP ?
Internet Control Message Protocol; used for diagnostics (e.g., ping).
🔹 What is packet fragmentation ?
Breaking data into smaller pieces for transmission.
🔹 What is MTU ?
Maximum Transmission Unit; the largest packet size allowed..
🔹 What is a broadcast addres ?
An address used to send data to all devices in a network.
🔹 What is a network address ?
The first address in a subnet, identifying the network.
🔹 What is the difference between IPv4 and IPv6 ?
IPv4 uses 32-bit addresses; IPv6 uses 128-bit addresses.
🔹 Why are IPv4 addresses running out ?
Because of the limited 32-bit address space.
🔹 What is IP exhaustion ?
The depletion of available IPv4 addresses.
🔹 How is IPv4 exhaustion mitigated ?
Through NAT, CIDR, and adoption of IPv6.
🔹 Can IPv4 and IPv6 work together ?
Yes, using dual-stack, tunneling, or translation methods.
🔹 What is dual-stack ?
Running IPv4 and IPv6 simultaneously on a device.
🔹 What is IP spoofing ?
Falsifying the source IP address in packets.
🔹 Is IPv4 secure ?
IPv4 itself has no built-in encryption; security depends on additional protocols.
🔹 What is TTL in IPv4 ?
Time To Live; limits how long a packet can circulate.
🔹 What is a gateway in IPv4 networking ?
A device that routes traffic between networks.
🔹 What is DNS ?
Domain Name System; translates domain names into IP addresses.
🔹 What is a reserved IP address ?
An address set aside for specific uses.
🔹 What is a multicast address ?
An address used to send data to multiple selected devices.
🔹 Is IPv4 still used today ?
Yes, IPv4 is still widely used alongside IPv6 worldwide.
