You are a network administrator for your company.The network consists of five Windows Server 2003 computers and 50 Windows XP Professional computers on a single subnet.
On Sunday, another administrator installs a new firewall between the LAN and the company’s T1 Internet connection.The network is configured as shown in the exhibit.
Local host names are resolved on the network by using a WINS server.All client computers are configured to use ISP1 for DNS name resolution.
On Monday morning, users report that they are no longer able to access secure and nonsecure Internet Web sites.
From a Windows XP Professional computer, you are able to succesfully perform the following tasks:
Ping the IP addresses of Web servers on the Internet.
Use Internet Explorer to open both secure and nonsecure Web sites by using an IP address in place of the URL.
You run the nslookup command and attempt to resolve an Internet fully qualified domain name (FQDN).You receive the following error message:
*** [131.107.100.200] can’t find www.microsoft.com: No response from server >
You need to use the minimum amount of administrative effort to provide users with the ability to browse Web sites on the Internet.
What should you do?
Exhibit:
A.
Configure the firewall to allow traffic on TCP ports 80 and 443.
B.
Configure the firewall to allow traffic on TCP port 53 and UDP port 53.
C.
Install and configure the DNS service on one of the local servers.
D.
Install and configure Microsoft Internet Security and Acceleration (ISA) Server on one of the local servers.