Explain How Network Addresses Impact Network Security 100-160 Practice Questions (Page 1)

Questions 1–5

1. 1application · easy

   A network administrator notices that an internal server is sending traffic to the internet with a source IP of 10.0.0.5. The administrator wants to ensure that the public internet sees a valid public IP address. What should be configured?

   • AConfigure the server's default gateway to be the ISP router.
   • BChange the server's IP address to a public IP address on the internal interface.
   • CEnable NAT on the router to translate the private source address to the public IP address.
   • DDisable the server's firewall to allow the private address to be routed.
   Reveal Solution Discussion Select an answer first
2. 2expert · hard

   A network administrator is troubleshooting a connectivity issue. A host with IP address 192.168.1.100/25 cannot communicate with a host at 192.168.1.200/25. Both hosts are connected to the same switch. What is the most likely cause?

   • AThe hosts are on different subnets because 192.168.1.100/25 is in the 192.168.1.0/25 subnet, while 192.168.1.200/25 is in the 192.168.1.128/25 subnet.
   • BThe hosts have duplicate IP addresses.
   • CThe hosts have incorrect MAC addresses.
   • DThe switch is not configured with a default gateway.
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A small business uses a single public IP address for its internet connection. The network administrator wants to allow multiple internal servers to be reachable from the internet on different ports while keeping the internal IP addresses hidden. Which configuration should be used?

   • AUse a proxy server to translate all inbound traffic to the internal servers.
   • BPlace all servers in the DMZ with public IP addresses assigned directly to their NICs.
   • CConfigure port forwarding on the router to map specific public ports to internal IP addresses.
   • DConfigure static NAT to map each internal server to a unique public IP address.
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A network engineer is troubleshooting connectivity between two hosts on the same IPv6 link-local network. The hosts are not communicating. The engineer checks the IPv6 configuration and sees that both hosts have addresses in the fe80::/10 range. What is the most likely reason for the lack of communication?

   • AThe hosts have different subnet prefixes, so they are on different networks.
   • BThe hosts have different interface identifiers, so they cannot communicate.
   • CThe hosts are on different VLANs or physical segments, even though they have the same link-local prefix.
   • DThe hosts have duplicate link-local addresses.
   Reveal Solution Discussion Select an answer first
6. 5expert · hard

   A company uses a NAT router with a single public IP address. The network administrator needs to allow external users to access an internal web server on port 443 and an internal FTP server on port 21. The administrator configures port forwarding for both services. Which additional consideration is important for security?

   • AThe internal web server and FTP server must have different private IP addresses.
   • BThe web server should be assigned a static private IP address to ensure the port forwarding rule remains valid.
   • CThe NAT router must be configured to allow inbound traffic on both ports, but outbound traffic from the servers will use the same public IP.
   • DThe FTP server should be placed in a DMZ or have additional security controls because FTP transmits credentials and data in cleartext.
   Reveal Solution Discussion Select an answer first