What is a feature of Cisco NetFlow Secure Event Logging for Cisco ASAs?
Correct Answer: B
Explanation: The ASA and ASASM implementations of NetFlow Secure Event Logging (NSEL) provide the following major functions: ... - Delays the export of flow-create events. Reference: https://www.cisco.com/c/en/us/td/docs/security/asa/asa92/configuration/general/asa-general-cli/ monitor-nsel.pdf
Question 177
Which two request methods of REST API are valid on the Cisco ASA Platform? (Choose two.)
Correct Answer: A,C
Available request methods are: GET - Retrieves data from the specified object. PUT - Adds the supplied information to the specified object; returns a 404 Resource Not Found error if the object does not exist. POST - Creates the object with the supplied information. DELETE - Deletes the specified object. PATCH - Applies partial modifications to the specified object. https://www.cisco.com/c/en/us/td/docs/security/asa/api/qsg-asa-api.html
Question 178
A Cisco ESA administrator has been tasked with configuring the Cisco ESA to ensure there are no viruses before quarantined emails are delivered. In addition, delivery of mail from known bad mail servers must be prevented. Which two actions must be taken in order to meet these requirements? (Choose two)
Correct Answer: A,E
We should scan emails using AntiVirus signatures to make sure there are no viruses attached in emails. Note: A virus signature is the fingerprint of a virus. It is a set of unique data, or bits of code, that allow it to be identified. Antivirus software uses a virus signature to find a virus in a computer file system, allowing to detect, quarantine, and remove the virus. SenderBase is an email reputation service designed to help email administrators research senders, identify legitimate sources of email, and block spammers. When the Cisco ESA receives messages from known or highly reputable senders, it delivers them directly to the end user without any content scanning. However, when the Cisco ESA receives email messages from unknown or less reputable senders, it performs antispam and antivirus scanning. We should scan emails using AntiVirus signatures to make sure there are no viruses attached in emails. Note: A virus signature is the fingerprint of a virus. It is a set of unique data, or bits of code, that allow it to be identified. Antivirus software uses a virus signature to find a virus in a computer file system, allowing to detect, quarantine, and remove the virus. SenderBase is an email reputation service designed to help email administrators research senders, identify legitimate sources of email, and block spammers. When the Cisco ESA receives messages from known or highly reputable senders, it delivers them directly to the end user without any content scanning. However, when the Cisco ESA receives email messages from unknown or less reputable senders, it performs antispam and antivirus scanning. We should scan emails using AntiVirus signatures to make sure there are no viruses attached in emails. Note: A virus signature is the fingerprint of a virus. It is a set of unique data, or bits of code, that allow it to be identified. Antivirus software uses a virus signature to find a virus in a computer file system, allowing to detect, quarantine, and remove the virus. SenderBase is an email reputation service designed to help email administrators research senders, identify legitimate sources of email, and block spammers. When the Cisco ESA receives messages from known or highly reputable senders, it delivers them directly to the end user without any content scanning. However, when the Cisco ESA receives email messages from unknown or less reputable senders, it performs antispam and antivirus scanning. Reference: b_ESA_Admin_Guide_12_0/b_ESA_Admin_Guide_12_0_chapter_0100100.html -> Therefore Outbreak filters can be used to block emails from bad mail servers. Web servers and email gateways are generally located in the DMZ so Note: The recipient access table (RAT), not to be confused with remote-access Trojan (also RAT), is a Cisco ESA term that defines which recipients are accepted by a public listener. b_ESA_Admin_Guide_12_0/b_ESA_Admin_Guide_12_0_chapter_0100100.html -> Therefore Outbreak filters can be used to block emails from bad mail servers. Web servers and email gateways are generally located in the DMZ so b_ESA_Admin_Guide_12_0/b_ESA_Admin_Guide_12_0_chapter_0100100.html -> Therefore Outbreak filters can be used to block emails from bad mail servers. Web servers and email gateways are generally located in the DMZ so Note: The recipient access table (RAT), not to be confused with remote-access Trojan (also RAT), is a Cisco ESA term that defines which recipients are accepted by a public listener.
Question 179
Which cryptographic process provides origin confidentiality, integrity, and origin authentication for packets?
Correct Answer: C
ESP (Encapsulating Security Payload) is a cryptographic process that provides origin confidentiality, integrity, and origin authentication for packets. ESP encrypts the payload of an IP packet with a symmetric key, and adds a header and a trailer to the packet. The header contains a security parameter index (SPI) and a sequence number, which are used to identify the security association (SA) and prevent replay attacks. The trailer contains padding and a next header field, which are used to align the packet and indicate the type of the original payload. ESP also adds an authentication data field at the end of the packet, which contains a message authentication code (MAC) that is computed over the entire ESP packet (except for the authentication data field itself) using a secret key and a hash function. The MAC provides data integrity and origin authentication for the packet. ESP can operate in two modes: tunnel mode and transport mode. In tunnel mode, ESP encapsulates the entire original IP packet, including the IP header, and adds a new IP header. This mode provides protection for the entire packet, but adds more overhead. In transport mode, ESP only encapsulates the payload of the original IP packet, and leaves the IP header intact. This mode provides protection only for the payload, but preserves the original IP header information. ESP is one of the two main protocols of IPsec, along with AH (Authentication Header). AH only provides data integrity and origin authentication, but not confidentiality. AH adds a header to the IP packet, which contains a MAC that is computed over the immutable fields of the IP header and the entire payload. AH does not encrypt the payload, and therefore does not protect it from eavesdropping. AH can also operate in tunnel mode or transport mode, but it is incompatible with NAT devices, which modify the IP header fields. IKE (Internet Key Exchange) is a protocol that is used to establish and manage SAs for IPsec. IKE negotiates the security parameters, such as the encryption and authentication algorithms, the keys, and the SPIs, for the IPsec protocols. IKE also performs mutual authentication between the IPsec peers, and establishes a secure channel for exchanging keying material. IKE has two versions: IKEv1 and IKEv2. IKEv1 consists of two phases: phase 1 and phase 2. In phase 1, IKEv1 establishes an IKE SA, which is a secure channel for phase 2. In phase 2, IKEv1 negotiates one or more IPsec SAs, which are used to protect the IPsec traffic. IKEv2 simplifies the IKE protocol by combining the two phases of IKEv1 into a single exchange. IKEv2 also supports more features, such as NAT traversal, EAP authentication, and MOBIKE. References := * Implementing and Operating Cisco Security Core Technologies (SCOR) v1.0, Module 3: VPN Technologies, Lesson 3.1: Site-to-Site VPNs, Topic 3.1.1: IPsec VPNs * IPsec - Wikipedia * AH and ESP protocols - IBM * How TLS provides identification, authentication, confidentiality, and integrity - IBM
Question 180
Drag and drop the solutions from the left onto the solution's benefits on the right.
