The Dynamic Host Configuration Protocol (DHCP) is a network management protocol used on TCP/IP networks to automate the assignment of IP addresses and other communication parameters to devices. A DHCP server maintains a pool of IP addresses and leases them to clients as they join the network. This process includes assigning an address, managing the lease duration, and reclaiming the address for reuse once the lease expires or the client disconnects. This functionality precisely matches the requirements of assigning, managing, and reclaiming IP addresses as stated in the question.

A. DNS: The Domain Name System (DNS) translates human-readable domain names (e.g., www.example.com) into machine-readable IP addresses but does not assign or manage the IP addresses for host configuration.

C. LDAP: The Lightweight Directory Access Protocol (LDAP) is an application protocol for accessing and maintaining distributed directory information services, typically used for user authentication and authorization, not IP address allocation.

D. ISMTP: This is not a recognized standard protocol. The standard protocol for email is SMTP (Simple Mail Transfer Protocol), which is responsible for sending and receiving email, not IP address management.

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1. Droms

R. (1997). RFC 2131: Dynamic Host Configuration Protocol. Internet Engineering Task Force (IETF). In Section 1

"Introduction

" the document states

"The Dynamic Host Configuration Protocol (DHCP) provides a framework for passing configuration information to hosts on a TCP/IP network. DHCP is based on the Bootstrap Protocol (BOOTP)

adding the capability of automatic allocation of reusable network addresses and additional configuration options." Available at: https://doi.org/10.17487/RFC2131

2. Stallings

W. (2016). Foundations of Modern Networking: SDN

NFV

and Cloud Computing. Pearson Education. In Chapter 5

Section 5.2 "The Internet Protocol

" the text describes DHCP's role: "DHCP automates the assignment of IP addresses

saving network administrators the effort of manual configuration... The protocol also provides for on-demand assignment of IP addresses and the automatic return of an address to the pool for reuse."

3. University of California

Berkeley

EECS 122 Course Materials. "Lecture 15: IP Addressing (CIDR

NAT

DHCP)." The lecture notes explain that DHCP is the standard mechanism for a host to automatically obtain an IP address

subnet mask

and default gateway from a server.

4. Mockapetris

P. (1987). RFC 1034: Domain Names - Concepts and Facilities. Internet Engineering Task Force (IETF). Section 2.1

"Name space

" defines the purpose of DNS as a hierarchical naming system

which is distinct from IP address assignment. Available at: https://doi.org/10.17487/RFC1034