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31 Cards in this Set
- Front
- Back
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Kurt, a network technician, has been notified that several PCs are infected and are sending spam emails. He wants to add a rule to the firewall to prevent the sending of emails from the internal network. Which of the following rules will prevent this?
A. Deny TCP port 25 outbound B. Deny UDP port 53 outbound C. Deny TCP port 110 outbound D. Deny UDP port 213 outbound |
A. Deny TCP port 25 outbound
NOTE: Port 25 is simple mail transport protocol if you block this you cannot send email |
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By default, which of the following ports would a network need to have opened to allow for the transmission of incoming and outgoing email? (Select TWO).
A. 21 B. 25 C. 80 D. 110 E. 123 |
B. 25 - SMTP (sending)
D. 110 POP 3 (Receiving) |
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Which of the following ports are used by default for web servers? (Select TWO).
A. 80 B. 110 C. 123 D. 143 E. 443 |
A. 80 http
E. 443 https (secure) |
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Sandy, a technician, is asked to not allow FTP traffic on a network. Which of the following ports should be blocked on the firewall to achieve this?
A. 21 B. 22 C. 23 D. 25 |
A. 21
File transport Protocol |
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Which of the following ports should be allowed through a firewall to allow DNS resolution to occur to an outside DNS server?
A. 20 B. 53 C. 80 D. 3389 |
B. 53
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Which of the following ports carries IMAP traffic, by default, on modern email systems?
A. 23 B. 25 C. 80 D. 143 |
D. 143
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Which of the following is the port number used by HTTP?
A. 21 B. 80 C. 443 D. 3389 |
B. 80
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Which of the following ports is the default telnet port?
A. 20 B. 21 C. 22 D. 23 |
D. 23 Telnet
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Users are unable to access the Internet but the users are able to send/receive email from their desktops. Which of the following ports is MOST likely being blocked?
A. 25 B. 80 C. 110 D. 143 |
B. 80 http
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Which of the following ports is the default telnet port?
A. 20 B. 21 C. 22 D. 23 |
D. 23 Telnet
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Which of the following ports does POP3 services use, by default?
A. 25 B. 110 C. 143 D. 443 |
B. 110
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Sandy, a network administrator, needs to allow all websites to be accessible by the sales team for business purposes. Which of the following ports need to be enabled on the firewall? (Select TWO).
A. 23 B. 25 C. 53 D. 80 E. 443 |
D. 80 - http
E. 443 - https |
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Which of the following ports does POP3 services use, by default?
A. 25 B. 110 C. 143 D. 443 |
B. 110 POP3
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Which of the following ports would have to be allowed through a firewall to allow SNMP traffic to pass on its default port? (Select TWO).
A. 22 B. 23 C. 143 D. 161 E. 162 F. 8080 |
D. 161 Simple Network Management Protocol (SNMP)
E. 162 Simple Network Management Protocol Trap (SNMPTRAP) |
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Which of the following ports would Kurt, a technician, need to open on a firewall to allow SSH on the default port?
A. 20 B. 21 C. 22 D. 23 |
C. 22 SSH
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What is port 20?
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FTP data transfer
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What is port 21?
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FTP control (command)
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What is port 22?
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Secure Shell (SSH) — used for secure logins, file transfers (scp, sftp) and port forwarding
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What is port 23?
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Telnet protocol—unencrypted text communications
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What is port 25?
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Simple Mail Transfer Protocol (SMTP)—used for e-mail routing between mail servers
NOTE: I think of it as "Send Mail to People" |
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What is port 53?
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Domain Name System (DNS)
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What is port 80?
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Hypertext Transfer Protocol (HTTP)
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What is TCP Port 110?
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Post Office Protocol v3 (POP3)
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What is TCP Port 119?
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Network News Transfer Protocol (NNTP)—retrieval of newsgroup messages
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What is UDP Port 123?
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Network Time Protocol (NTP)—used for time synchronization
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What is TCP Port 143?
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Internet Message Access Protocol (IMAP)—management of email messages
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What is UDP Port 161?
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Simple Network Management Protocol (SNMP)
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What is UDP Port 162
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Simple Network Management Protocol Trap (SNMPTRAP)
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What is TCP Port 443?
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Hypertext Transfer Protocol over TLS/SSL (HTTPS)
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What is port TCP/UDP 3389?
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Microsoft Terminal Server (RDP) officially registered as Windows Based Terminal (WBT)
NOTE: Remote Desktop Protocol |
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What is TCP Port 8080?
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HTTP alternate (http_alt)—commonly used for Web proxy and caching server, or for running a Web server as a non-root user
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