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Question 41

Which IPsec component is responsible for negotiating cryptographic parameters between VPN peers?

1. IKE
2. ESP
3. AH
4. GRE

Correct Answer: 1

Explanation

Internet Key Exchange, or IKE, negotiates the security parameters required for an IPsec VPN between peers. During IKE negotiation, the devices authenticate each other and agree on parameters such as encryption algorithms, integrity algorithms, Diffie-Hellman groups, and authentication methods. IKEv2 is commonly used in modern Cisco deployments because it provides a streamlined negotiation process and strong security capabilities. ESP and AH are IPsec protocols that protect traffic, while GRE provides tunneling without inherently providing encryption. IKE must successfully establish the required security associations before protected IPsec traffic can be exchanged between the VPN peers.

Question 42

Which Cisco technology provides centralized authentication and authorization for network access using 802.1X?

1. Cisco Umbrella
2. Cisco Secure Client
3. Cisco ISE
4. Cisco Secure Firewall

Correct Answer: 3

Explanation

Cisco Identity Services Engine, or ISE, provides centralized authentication and authorization for network access and commonly integrates with 802.1X. It can authenticate users and devices before granting access to wired or wireless networks. After authentication, ISE can apply authorization policies based on identity, device profile, location, security posture, and other contextual information. This allows organizations to implement granular access policies rather than simply trusting a device based on its physical connection. Cisco Umbrella focuses on cloud security, Secure Client provides endpoint connectivity and security, and Secure Firewall provides traffic inspection and enforcement.

Question 43

Which IPsec protocol can provide encryption, integrity, authentication, and anti-replay protection?

1. AH
2. ESP
3. ICMP
4. ARP

Correct Answer: 2

Explanation

Encapsulating Security Payload, or ESP, can provide encryption, integrity, authentication, and anti-replay protection for IP traffic. The exact services depend on the algorithms and security associations configured for the IPsec deployment. ESP is widely used in modern Cisco VPN implementations because it can provide confidentiality as well as protection against modification and replay attacks. AH can provide authentication and integrity but does not encrypt traffic. ICMP and ARP are network protocols that do not provide the cryptographic security services associated with IPsec. ESP can operate in transport or tunnel mode depending on the VPN architecture.

Question 44

Which AAA protocol is commonly preferred for controlling administrative access to Cisco network devices?

1. RADIUS
2. TACACS+
3. SNMP
4. LDAP

Correct Answer: 2

Explanation

TACACS+ is commonly used for centralized administrative access control on Cisco network devices. It supports authentication, authorization, and accounting and separates authentication from authorization, allowing administrators to control which commands specific users can execute. This provides granular administrative policy enforcement. RADIUS is widely used for network access authentication such as 802.1X, although it can also support other AAA scenarios. SNMP is primarily used for network monitoring and management, while LDAP is commonly used as a directory service and identity repository. TACACS+ is therefore particularly useful when organizations need centralized control over administrator logins and command authorization.

Question 45

Which Cisco security feature can block access to websites based on URL categories?

1. URL filtering
2. DHCP Snooping
3. Port Security
4. HSRP

Correct Answer: 1

Explanation

URL filtering allows security administrators to control web access based on destination URLs or URL categories. Depending on the Cisco security platform and available licensing, administrators can create policies that permit or block categories such as social networking, gambling, malware, phishing, or other web-content classifications. URL filtering provides more granular web-security control than simply blocking an IP address or TCP port. DHCP Snooping protects against rogue DHCP servers, Port Security controls MAC addresses on switch interfaces, and HSRP provides gateway redundancy. URL filtering is therefore useful when organizations need to enforce acceptable-use and web-access policies across users and devices.

Question 46

Which VPN type is commonly used to connect branch-office networks over the public Internet?

1. Remote-access VPN
2. Site-to-site VPN
3. Clientless VPN
4. Host-only VPN

Correct Answer: 2

Explanation

A site-to-site VPN is commonly used to securely connect branch-office networks over an untrusted network such as the public Internet. VPN gateways at each location establish a secure tunnel and protect traffic between the networks. IPsec is frequently used for this purpose because it can provide encryption, authentication, integrity, and anti-replay protection. Remote-access VPNs are instead designed for individual users connecting from remote locations. Site-to-site VPNs can provide transparent connectivity between internal networks while allowing organizations to use Internet infrastructure instead of dedicated private circuits. Proper routing, encryption, authentication, and security policies are required for successful deployment.

Question 47

Which security technology protects Layer 2 Ethernet frames using cryptographic encryption?

1. MACsec
2. NAT
3. GRE
4. HSRP

Correct Answer: 1

Explanation

MACsec provides Layer 2 security by protecting Ethernet frames with cryptographic mechanisms. It can provide confidentiality, integrity, data-origin authentication, and protection against certain replay attacks depending on the configuration. MACsec is useful for securing traffic across Ethernet links where administrators require protection at Layer 2. NAT translates IP addresses, GRE provides tunneling without inherent encryption, and HSRP provides first-hop gateway redundancy. MACsec can be deployed between supported network devices and is particularly useful for securing links within enterprise, campus, and data-center environments where sensitive traffic crosses potentially exposed Ethernet segments.

Question 48

Which IPsec authentication method is generally more scalable for large numbers of VPN peers?

1. Pre-shared keys
2. Digital certificates
3. Static passwords
4. PAP

Correct Answer: 2

Explanation

Digital certificate authentication is generally more scalable than manually configured pre-shared keys when an organization has many VPN peers. Certificates can be issued, managed, renewed, and revoked through a Public Key Infrastructure. Each peer can have its own certificate, reducing the need to manually maintain numerous shared secrets. Pre-shared keys can be simple and practical for smaller deployments but become difficult to manage as the number of VPN relationships increases. Certificate-based authentication also provides stronger identity management when properly implemented. Cisco VPN deployments can use PKI and digital certificates with IKE to authenticate peers before establishing IPsec security associations.

Question 49

Which Cisco security feature helps prevent MAC address spoofing on an access switch port?

1. DHCP Snooping
2. Port Security
3. URL Filtering
4. IKE

Correct Answer: 2

Explanation

Port Security can help prevent unauthorized MAC addresses from being used on a switch port. Administrators can configure secure MAC addresses and specify how the switch should respond when a violation occurs. Depending on the configured violation mode, the switch can restrict, drop, or otherwise handle unauthorized traffic. Port Security is commonly applied to access ports where a known number of endpoint devices are expected. DHCP Snooping focuses on DHCP messages and binding information, URL filtering controls web destinations, and IKE negotiates VPN security parameters. Port Security therefore directly addresses unauthorized MAC address usage at the Layer 2 access-port level.

Question 50

Which Cisco technology provides secure cloud-based DNS protection for users regardless of their physical location?

1. Cisco ISE
2. Cisco Umbrella
3. Cisco Secure Firewall
4. Cisco TACACS+

Correct Answer: 2

Explanation

Cisco Umbrella provides cloud-delivered security services that can enforce policies at the DNS layer. Because policy enforcement is provided through cloud infrastructure, users can receive protection whether they are inside the corporate network, working remotely, or using other supported network connections. Umbrella can block requests associated with malicious, phishing, or other unwanted destinations according to configured policies and security intelligence. Cisco ISE focuses on identity-based network access, Secure Firewall provides firewall security and traffic inspection, and TACACS+ is an AAA protocol. Umbrella therefore provides an additional security layer that can operate beyond the traditional network perimeter.

Question 51

Which protocol is used to securely exchange keys and negotiate IPsec security associations?

1. IKEv2
2. HTTP
3. TFTP
4. FTP

Correct Answer: 1

Explanation

IKEv2 is used to negotiate IPsec security associations and securely establish cryptographic parameters between VPN peers. It handles peer authentication, cryptographic proposal negotiation, Diffie-Hellman key exchange, and security association establishment. IKEv2 is commonly preferred in modern Cisco VPN deployments because it provides an efficient and robust negotiation framework. HTTP is used for web communication, while FTP and TFTP are file-transfer protocols. IKEv2 does not itself replace IPsec; rather, it establishes the parameters and keys that allow IPsec to protect the actual user traffic exchanged through the VPN.

Question 52

Which security mechanism can detect suspicious activity but does not necessarily block the traffic automatically?

1. IDS
2. IPS
3. NAT
4. Port Security

Correct Answer: 1

Explanation

An Intrusion Detection System, or IDS, monitors network activity and identifies potentially malicious or suspicious behavior. Depending on its design, an IDS primarily generates alerts and provides visibility rather than directly blocking the detected traffic. An Intrusion Prevention System, or IPS, can take active action to block or drop traffic based on configured security policies. NAT translates addresses, while Port Security controls MAC addresses on switch ports. IDS technology can be valuable for security monitoring because it helps administrators identify attack attempts and investigate suspicious events without necessarily modifying traffic flows.

Question 53

Which Cisco security feature can dynamically learn IP-to-MAC bindings from DHCP traffic?

1. Dynamic ARP Inspection
2. DHCP Snooping
3. IP Source Guard
4. MACsec

Correct Answer: 2

Explanation

DHCP Snooping dynamically builds a binding database by inspecting DHCP traffic on a switch. The database can contain information such as the assigned IP address, client MAC address, VLAN, and switch interface. This information can then be used by other security features. Dynamic ARP Inspection uses the bindings to validate ARP messages, while IP Source Guard can use them to restrict source addresses. MACsec provides cryptographic protection for Ethernet frames and does not create DHCP bindings. DHCP Snooping therefore provides an important foundation for multiple Layer 2 security mechanisms and helps defend against rogue DHCP servers and related attacks.

Question 54

Which Cisco firewall capability allows policies to identify traffic based on the application being used?

1. Application Control
2. DHCP Relay
3. HSRP
4. NTP

Correct Answer: 1

Explanation

Application Control allows Cisco security platforms to identify applications and use application information when enforcing security policies. This provides greater visibility and control than relying solely on IP addresses and ports. Administrators can create rules that allow or block specific applications or application categories according to organizational requirements. For example, traffic using a common TCP port can potentially represent different applications, so application identification can provide more precise policy enforcement. DHCP Relay forwards DHCP requests between networks, HSRP provides gateway redundancy, and NTP synchronizes device clocks. Application-aware security is therefore useful for modern networks where applications frequently use shared protocols and ports.

Question 55

Which IPsec mode encapsulates the entire original IP packet inside a new IP packet?

1. Transport mode
2. Tunnel mode
3. Authentication mode
4. Host mode

Correct Answer: 2

Explanation

IPsec tunnel mode encapsulates the complete original IP packet inside a new IP packet. The original IP header and payload are protected within the tunnel, while a new outer IP header is used to route the protected packet between VPN endpoints. Tunnel mode is commonly used for site-to-site VPNs where security gateways protect traffic between entire networks. Transport mode generally protects the original packet’s payload while retaining the original IP header. Tunnel mode is particularly useful across public networks because it hides the original internal addressing information from the transit network and provides a complete protected packet structure.

Question 56

Which AAA protocol commonly provides authentication for wireless 802.1X access?

1. RADIUS
2. TACACS+
3. FTP
4. SNMP

Correct Answer: 1

Explanation

RADIUS is commonly used to provide centralized authentication and authorization for 802.1X wireless access. The wireless infrastructure forwards authentication requests to a RADIUS server, such as Cisco ISE, which evaluates the user’s or device’s credentials and returns an authorization decision. This enables centralized access policies instead of maintaining authentication information independently on every wireless device. TACACS+ is more commonly associated with administrative access to network infrastructure, while FTP is a file-transfer protocol and SNMP is used for network management. RADIUS can also support accounting functions and integrate with external identity sources in enterprise environments.

Question 57

Which security feature validates the source IP address of packets using DHCP Snooping information?

1. IP Source Guard
2. Dynamic ARP Inspection
3. Port Security
4. MACsec

Correct Answer: 1

Explanation

IP Source Guard helps prevent source IP address spoofing by restricting traffic according to trusted IP-to-MAC bindings. These bindings are commonly obtained from DHCP Snooping. When traffic arrives on a protected interface, the switch can verify whether the source information matches the expected binding. Traffic that violates the configured source-address policy can be dropped. Dynamic ARP Inspection performs a similar validation concept specifically for ARP messages, while Port Security focuses on MAC addresses and MACsec protects Ethernet frames cryptographically. IP Source Guard is therefore useful for enforcing source-address integrity at the Layer 2 access layer.

Question 58

Which component verifies whether a digital certificate was issued by a trusted authority?

1. Certificate Authority
2. Certificate chain
3. DHCP Server
4. DNS Resolver

Correct Answer: 2

Explanation

A certificate chain allows a device to establish trust between an end-entity certificate and a trusted root certificate authority. During certificate validation, the device checks signatures and trust relationships through the certificate chain. If the chain terminates at a trusted root CA and the certificate satisfies validity and policy requirements, the identity can be considered trusted according to the configured PKI rules. A Certificate Authority issues certificates, while DHCP and DNS perform network configuration and name-resolution functions. Proper certificate validation also involves checking expiration, usage constraints, and revocation status when applicable. Certificate chains are fundamental to scalable PKI-based authentication.

Question 59

Which Cisco security solution centrally manages supported Cisco Secure Firewall devices?

1. Cisco ISE
2. Cisco Umbrella
3. Cisco Secure Firewall Management Center
4. Cisco Secure Client

Correct Answer: 3

Explanation

Cisco Secure Firewall Management Center provides centralized management for supported Cisco Secure Firewall devices. It allows administrators to configure and manage security policies, access control rules, NAT, intrusion policies, objects, VPN settings, and other features from a centralized management platform. It also provides monitoring and visibility into firewall events and network activity. Cisco ISE focuses on identity and network access control, Umbrella provides cloud-delivered security services, and Secure Client operates primarily on endpoints. Centralized firewall management is particularly useful in environments where multiple security appliances require consistent policies and centralized operational visibility.

Question 60

Which security service provides confidentiality so that unauthorized users cannot read protected IPsec traffic?

1. Integrity
2. Authentication
3. Encryption
4. Accounting

Correct Answer: 3

Explanation

Encryption provides confidentiality by transforming readable information into ciphertext that unauthorized parties cannot understand without the appropriate cryptographic key. In IPsec, encryption is commonly provided through ESP using a negotiated encryption algorithm. Integrity is a separate security service that helps detect unauthorized modification, while authentication verifies the identity or origin of communicating peers or data. Accounting records activity and resource usage. Confidentiality is particularly important when VPN traffic crosses public or otherwise untrusted networks. Proper key management, secure algorithms, and strong authentication are required to ensure that encrypted VPN communications remain protected against unauthorized disclosure.