An inbound access list has been configured on a serial interface to deny packet entry for TCP and UDP ports 21， 23 and 25. What types of packets will be permitted by this ACL (Choose three.)（）。
举一反三
- 如果在网络的入口处通过设置ACL封锁了TCP和UDP端口21、23和25，则能够访问该网络的应用是
- 如果在网络的入口处通过设置ACL封锁了TCP和UDP端口21、23和25，则能够访问该网络的应用是（ ）。 A: FTP B: DNS C: SMTP D: Telent
- Which three statements are true about DAI？（） A: DAI intercept all ARP packets on untrusted ports B: DAI determines the validity of an ARP packet based on the valid MAC address-to-IP address bindings stored in the DHCP Snooping database. C: DAI is used to prevent against a DHCP Snooping attack. D: DAI forwards all ARP packets received on a trusted interface without any checks. E: DAI forwards all ARP packets on untrusted ports. F: DAI determines the validity of an ARP packet based on the valid MAC address-to-IP address bindings stored in the CAM table.
- John has three sisters. Mary is the ______ of the three.
- Mobile phone interface can be divided into three types: logical user interface, physical user interface and graphical user interface ( )