Question 11

The corporate DNS server is misconfigured.

A user may be unable to log in to https://www.bank.com due to issues resolving the domain name to the correct IP address, which is often a result of a misconfigured corporate DNS server.

A) The corporate DNS server is misconfigured.

This option is correct because if the DNS server is not configured properly, it may fail to resolve the domain www.bank.com to its corresponding IP address. This would prevent the user from successfully accessing the website, which is critical for logging in.

B) An explicit deny is on the ACL.

This option is incorrect as there is no evidence from the provided extract that an explicit deny rule exists in the Access Control List (ACL). The ACL listed permits access to various IP ranges, implying that access issues are not due to this factor.

C) The default route is not set properly.

While a misconfigured default route could potentially prevent access to external networks, the extract shows that there is a default route configured (0.0.0.0 interface G0/1). Thus, this option does not explain the inability to log in to the specific website.

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

This option is also incorrect since the ability to access a specific website does not solely depend on the use of a dynamic routing protocol. The static default route in place suggests that routing to external networks should function correctly even without dynamic protocols.

Conclusion

The most plausible reason for the inability to log in to https://www.bank.com is a misconfigured corporate DNS server, which would hinder the resolution of the domain name. Other options fail to account for the specific context provided in the router excerpts, making them less relevant to the user's login issue.