Network Protocols

Correct Answer: Wireshark

The best protocol to use when capturing DHCP packets and analyzing the interaction between the DHCP server and a device is Wireshark. Wireshark allows for detailed analysis of network packets, which includes content, sources, destinations, and protocols used. In this particular case, it allows the technician to capture DHCP packets, analyze their content and the interaction between the DHCP server and the target device. On the other hand, Ping, Traceroute, and nslookup protocols are not designed to capture and analyze packets. Ping is used to test the reachability of a host on an Internet Protocol (IP) network and to measure the round-trip time for packets sent from the source host to the destination. Traceroute is utilized to display the path that a packet takes to reach a destination. nslookup is used primarily to obtain domain name or IP address mapping, or for any specific DNS record. Therefore, in this case, only Wireshark is appropriate for capturing DHCP packets and analyzing the interaction.

Correct Answer: ICMP

The Internet Control Message Protocol (ICMP) is the best answer because it's a network protocol that's used by network devices, like routers, to send error messages and operational information. So, a network technician can use ICMP to troubleshoot connectivity issues between two routers. FTP, POP3, and IMAP are not the correct answers. These are, respectively, a file transfer protocol, and two different mail retrieval protocols. They could be used for the functioning of applications on the network, but not to troubleshoot connectivity issues between routers.

Correct Answer: HTTPS

The user is trying to access a secure website, which would typically involve the HTTPS protocol, standing for Hypertext Transfer Protocol Secure. HTTPS uses SSL/TLS protocol to encrypt the communications, so the user's interactions with the website are secure. If the HTTPS protocol is blocked on the firewall, the user won't be able to access secure websites. The other options - SSH, Telnet, and SNMP - are not directly related to accessing secure websites. SSH is used for secure remote login, Telnet for unsecure remote login and SNMP for network management, but not for secure website access. Therefore, these protocols being blocked would not result in the problem described.