July 2 - apipa extended

Which IP address range is reserved for APIPA?

169.254.0.0 to 169.254.255.255 is reserved for Automatic Private IP Addressing.

What does APIPA stand for, and what does it do?

Automatic Private IP Addressing assigns an IP address automatically when a DHCP server cannot be reached, allowing local network communication.

What is the default subnet mask used with APIPA addresses?

255.255.0.0

What service failure typically causes a device to use an APIPA address?

Failure to contact a DHCP server.

Which protocol does a system use to check for conflicts before assigning an APIPA address?

ARP (Address Resolution Protocol)

What port does DHCP use for client-to-server communication?

UDP port 67

What port does a DHCP server use to respond to clients?

UDP port 68

What is the function of a DHCP lease?

It defines the duration for which an IP address is assigned to a client by the DHCP server.

What happens when a DHCP lease expires?

The client must request a new lease or renew the existing one; if not renewed, the IP is returned to the pool.

What configuration should be used when a device must always use the same IP address?

Assign a static IP address or use DHCP reservation based on MAC address.

What class is the IP address 192.168.0.1?

Class C

Which of the following is a private IP address?a. 172.33.5.1 b. 192.168.100.10 c. 11.0.0.1 d. 223.0.0.5

b. 192.168.100.10 is a private IP address.

What is the range of Class A private IP addresses?

10.0.0.0 to 10.255.255.255

What address range is reserved for Class B private IP addresses?

172.16.0.0 to 172.31.255.255

What makes an IP address routable on the internet?

It must be a public IP address, assigned by an ISP or authority like IANA, and not fall within reserved or private ranges.

What command shows detailed network configuration in Windows?

ipconfig /all displays full adapter configuration including MAC address, DNS, and DHCP status.

What command releases the current DHCP lease?

ipconfig /release

What command requests a new IP address from the DHCP server?

ipconfig /renew

What might be the cause if a computer receives a 169.254.x.x address?

It failed to contact a DHCP server and defaulted to APIPA.

Which command clears cached DNS entries on a Windows machine?

ipconfig /flushdns

What type of address is used to communicate with devices on the same subnet without routing?

A local IP address or link-local address, such as APIPA in IPv4 or FE80::/10 in IPv6.

What tool can test basic network connectivity to another host?

ping sends ICMP echo requests to verify if a target is reachable.

Which utility traces the route packets take to a destination?

tracert in Windows or traceroute in Linux/Mac.

What is the purpose of NAT in networking?

Network Address Translation allows multiple private IP addresses to share a single public IP when accessing the internet.

Which protocol translates domain names to IP addresses?

DNS (Domain Name System)

What role does a default gateway play in a network configuration?

It acts as the access point or router that routes traffic from a local network to devices on other networks, such as the internet.