Simulation Lab 4.2: Module 04 Use Remote Desktop Configure Firewall

What transport protocol/ports do DNS and DHCP use?

UDP 53 / UDP 67 and 68 DNS (Domain Name Server) is used to translate domain names to IP addresses. It uses UDP port 53 for transport. DHCP (Dynamic Host Configuration Protocol) is used for automatic IP address assignments. Client and server use UDP ports 67 and 68 for exchanging DHCP messages.

HTTP and HTTPS are TCP-based protocols. Which of the following ports do they use?

80 and 443 HTTP and HTTPS protocols use port numbers 80 and 443. HTTPS is an example of a secure protocol because it runs over SSL. Port 81 is not one of the well-known ports but can be used as a custom port for applications. Port 25 is a well-known port used by SMTP protocol. UDP port number 514 is used by the SYSLOG protocol.

One of the users in your organization has just re-installed the operating system on his system. He notices that the email software can be accessed after the reinstallation, but all the old emails have disappeared. What could be the cause of this problem?

POP3 was used on the mail client software POP3 is an email protocol used for communication between a client and a mail server. When using the POP3 protocol, emails are downloaded from the server and deleted from the server. If you do not perform a backup, you could lose your emails after PC reinstallation. SMTP and SMTPS protocols are mostly used today for communication between mail servers (mail relaying). IMAP and IMAP over SSL(IMAPS) protocol are also used for client-mail server communication, but email messages are not deleted from the server.

You work as a network administrator in a domain environment. You have a new firewall and need to configure it. You are asked to create web filtering and firewall rules based on domain groups. Which of the following protocol will you use to integrate your firewall directly with Active Directory?

LDAP LDAP is a Lightweight Directory Access protocol used to authenticate and authorize users. This protocol is used to integrate the firewall with Active Directory. OpenLDAP is not a protocol but software that also uses LDAP. FTP(File Transfer Protocol) is used for data transfer between hosts. RADIUS (Remote Authentication Dial-in User Service) is also used for user authentication and authorization but uses a client/server model where the RADIUS server defines rules for RADIUS clients (usually network devices) and authenticate users.

You work as a network administrator and are responsible for configuring network firewalls, routers and switches. You have configured rules between the user and server VLANs. You received a request from your development team to create a new rule that allows port TCP 1433 to the database server. Based on the port number, which database is installed on the server.

SQL SQL is Microsoft's relational database that is used in this case because, by default, it uses TCP port 1433 for client connections. Oracle database uses TCP port 1521 for listener. MySQL is one of the open-source databases that uses TCP port 3306. PostgreSQL is another open-source database that uses TCP port 5421 by default. OrientDB is yet another open-source database that, by default, uses port 2424.