Objective: Write a memo summarizing port numbers and services run on most networks. Discuss well-known ports and describe the most commonly used ports: 25,53,80,110,143,443 and 993.

Description: Alexander Rocco Corporation has multiple OSs running in its many branch offices. Before conducting a penetration test to determine the network's vulnerabilities, you must analyze the services currently running on the network. Leilani Kaikea, a member of your security team experienced in programming and database design but weak in networking concepts, wants to be briefed on network topology issues as Alexander Rocco Corporation.

Write a memo to Leilani summarizing port numbers and services that run on most networks. The memo should discuss the concepts of well-known ports and give a brief description of the most commonly used ports: 25,53,80,110,143,443and 993.