This chapter covers the following topics:
Web Authentication scenarios
Configuring Centralized Web Authentication
Building CWA authorization rules
Verifying Centralized Web Authentication
As discussed in Chapter 4, “Non-802.1X Authentications,” just because there is no configured supplicant on an endpoint does not mean the user of that endpoint does not need to authenticate. Consider the use cases of guests or visitors, or maybe just a misconfiguration or an expired credential for an end user. The user may still require access to the network.
Enter Web Authentication, commonly referred to as just WebAuth. With WebAuth, an authenticator can send a user to a locally hosted web page—that is, a web page hosted on the local device itself (the switch, wireless controller, or even the firewall or VPN concentrator) where a user can submit a username and password.
As mentioned in Chapter 4, there are multiple types of WebAuth, and Centralized WebAuth (CWA) is the type used with Cisco Secure Access and ISE. CWA is the focus of the Implementing and Configuring Cisco Identity Services Engine SISE 300-715 exam and, therefore, the main focus of this book.
“Do I Know This Already?” Quiz
The “Do I Know This Already?” quiz allows you to assess whether you should read this entire chapter thoroughly or jump to the “Exam Preparation Tasks” section. If you are in doubt about your answers to these questions or your own assessment of your knowledge of the topics, read the entire chapter. Table 12-1 lists the major headings in this chapter and their corresponding “Do I Know This Already?” quiz questions. You can find the answers in Appendix A, “Answers to the ‘Do I Know This Already?’ Quizzes and Q&A Sections.”
Table 12-1 “Do I Know This Already?” Section-to-Question Mapping
Foundation Topics Section |
Questions |
|---|---|
Web Authentication Scenarios |
5 |
Configuring Centralized Web Authentication |
1, 3–6 |
Building CWA Authorization Policies |
3 |
Verifying Centralized Web Authentication |
2, 7–10 |
1. Before a Cisco switch can generate a self-signed certificate, what configuration is required?
a. The internal CA must be enabled.
b. An IPv6 address must be configured.
c. A Cisco switch cannot generate a self-signed certificate.
d. A domain name must be configured.
2. Which statement about URL-Redirect ACLs is true?
a. A URL redirection ACL can be downloaded from ISE to a NAD.
b. A URL redirection must be preconfigured locally on the NAD, and ISE applies it through the use of RADIUS attribute/value pairs (AV pairs).
c. There is no ACL needed for URL redirection.
d. A URL redirection ACL and its ACEs must be configured both in ISE and on the NAD.
3. Which of the following settings is required for a WLAN to support CWA on the Cisco WLC?
a. SNMP NAC
b. Layer 3 authentication
c. ISE NAC
d. Fast transition
4. For wired and wireless MAB, which option must be configured for unknown identities?
a. Drop
b. Continue
c. Reject
d. Pass
5. Which of the following rule types need to be created for CWA? (Choose two.)
a. A WebAuth authentication rule must be created for the authentication through the web portal.
b. An authorization rule must be created to redirect the user to the CWA portal.
c. An authentication rule must be created to permit access to users who have successfully authorized through the CWA portal.
d. An authorization rule must be created to permit access to users who have successfully authenticated through the CWA portal.
e. A WebAuth authentication rule must be created to redirect the end user to the CWA portal.
6. Which statement is true regarding network segmentation and Web Authentication?
a. Network segmentation should never be used with Web Authentication; they are mutually exclusive technologies.
b. VLAN changes may be used, and TrustSec SGTs may be used, but VLAN changes and SGTs can never be used together.
c. Only TrustSec SGTs can be used with Web Authentication to provide segmentation.
d. VLAN changes should only be used with devices that can recognize a change and request a new DHCP address.
7. Which of the following statements about CWA is true?
a. CWA is configured exactly the same for both wired and wireless NADs.
b. CWA must leverage different policy sets when configured for wired and wireless.
c. With CWA, the switch isn’t aware of the Web Authentication and only identifies the session as using MAB.
d. CWA stands for Cisco Wide-area Authorization.
8. Which command on a NAD displays information about a URL-redirected session, including the MAC address, IP address, dACL, URL-Redirect ACL, and the URL the end user is being redirected to?
a. show epm redirection
b. show authentication sessions
c. show epm authentication | include redirection
d. show authentication session interface [interface-name]
9. Which of the following locations in the ISE GUI is the best one to examine to validate that CWA is working?
a. Policy > Policy Elements > Results > Authorization
b. Operations > RADIUS > Live Log
c. Policy > Policy Elements > Results > Authentication
d. Operations > Results
10. Which of the following statements most accurately describes the use of Change of Authorization (CoA) in relation to CWA?
a. The CoA-Reauth causes the NAD to reauthenticate the endpoint within the same session, and ISE is then able to tie together the MAB and CWA authentications.
b. The CoA sends a Packet of Disconnect (PoD) to the NAD, which starts a new session based on the web credentials.
c. The CoA-Reauth causes the NAD to reauthenticate the endpoint, which starts a new session based on the web credentials.
d. The CoA sends a PoD to the NAD, and ISE is able to tie the original MAB session to the new Web Authentication session by correlating the MAC addresses from both authentication sessions.