Difficulty: Medium

Average Score: 50%

Given the following router excerpts: show ip route Default route 0.0.0.0 interface G0/1 show ip access list permit IP 192.168.1.0/24 0.0.0.0 any anypermit IP 172.16.0.0/16 0.0.0.0 any any permit IP 10.0.0.0/8 0.0.0.0 any any permit TCP www.bank.com 0.0.0.0 http any Which of the following is the most likely reason that a user would be unable to log in to https://www.bank.com?

Which of the following is the most likely reason that a user would be unable to log in to https://www.bank.com?

Rationale

The corporate DNS server is misconfigured.

A misconfigured DNS server can lead to the inability to resolve the domain name www.bank.com to its corresponding IP address, preventing users from accessing the website despite other network settings being correct.

A (The corporate DNS server is misconfigured.) CORRECT

A misconfiguration in the corporate DNS server would directly impact the ability of users to resolve the hostname www.bank.com. If the DNS cannot translate the domain into an IP address, the user will not be able to connect to the site, making this the most likely reason for login issues.

B (An explicit deny is on the ACL.) YOUR ANSWER

An explicit deny in the access control list (ACL) would block specific traffic, but the provided excerpts do not indicate any denies for traffic headed towards www.bank.com. The permits listed in the ACL suggest that traffic intended for this website is allowed, making an explicit deny unlikely to be the cause of the login failure.

C (The default route is not set properly.) YOUR ANSWER

While an incorrect default route could lead to routing issues, the excerpt shows a default route configured to interface G0/1. If this route were incorrect, it would typically affect broader internet connectivity rather than specifically preventing access to www.bank.com.

D (The router is not using a dynamic routing protocol.) YOUR ANSWER

The lack of a dynamic routing protocol could impact the router's ability to learn routes dynamically, but the default route is already configured. As long as the default route is functional, static routes can still enable access to external sites, including www.bank.com.

Conclusion

A properly functioning DNS server is crucial for resolving domain names to IP addresses, which is essential for accessing websites. In this case, a misconfigured corporate DNS server is the most plausible explanation for a user's inability to log in to https://www.bank.com, as it would directly hinder the necessary name resolution process. Other options, while relevant to network functionality, do not specifically address the issue of domain name resolution.

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