Cisco 300-730 Dumps

The same-security-traffic intra-interface command lets traffic enter and exit the same interface, which is normally not allowed. This feature might be useful for VPN traffic that enters an interface, but is then routed out the same interface. The VPN traffic might be unencrypted in this case, or it might be reencrypted for another VPN connection. For example, if you have a hub and spoke VPN network, where the security appliance is the hub, and remote VPN networks are spokes, for one spoke to communicate with another spoke, traffic must go into the security appliance and then out again to the other spoke.

IKE Message from X.X.X.X Failed its Sanity Check or is Malformed

This debug error appears if the pre-shared keys on the peers do not match. In order to fix this issue, check the pre-shared keys on both sides.

1d00H:%CRPTO-4-IKMP_BAD_MESSAGE: IKE message from 198.51.100.1 failed its

sanity check or is malformed

The first of the two TS payloads is known as TSi (Traffic Selector- initiator). The second is known as TSr (Traffic Selector-responder). TSi specifies the source address of traffic forwarded from (or the destination address of traffic forwarded to) the initiator of the Child SA pair.

If the responder's policy does not allow it to accept any part of the proposed Traffic Selectors, it responds with a TS_UNACCEPTABLE Notify message.

The MMNOSTATE failure occurs when the ISAKMP policy priority values are not configured correctly on both devices. The ISAKMP policy priority values are used to determine the order in which the ISAKMP policies are applied. If the priority values do not match between the two devices, the ISAKMP tunnel may not be established correctly, resulting in the MMNOSTATE failure. To resolve this issue, the engineer should ensure that the ISAKMP policy priority values are configured correctly on both the router and the peer.

The user group is used in conjunction with Host Address to form a group-based URL. If you specify the Primary Protocol as IPsec, the User Group must be the exact name of the connection profile (tunnel group). For SSL, the user group is the group-url of the connection profile.

The correct answer is D. IKEv2 profile. A FlexVPN tunnel requires an IKEv2 profile to define the parameters for the IKEv2 negotiation and the IPsec security association. The IKEv2 profile references the IKEv2 keyring, the authentication method, the identity of the peers, and other options. The IKEv2 profile is then applied to a virtual tunnel interface (VTI) or a dynamic virtual tunnel interface (DVTI) to protect the tunnel with IPsec12. An EAP configuration is used for authentication with Extensible Authentication Protocol (EAP), which is optional for FlexVPN3. A multipoint GRE tunnel interface is used for DMVPN, not FlexVPN. An IKEv1 policy is used for IKEv1, not IKEv2, which is the protocol for FlexVPN.

says clearly: In group-policy webvpn configuration mode, you can specify (list of things, including url-list).

According to the Implementing Secure Solutions with Virtual Private Networks (SVPN) documents and learning resources available at cisco.com, the two features that provide headend resiliency for Cisco AnyConnect clients are:

• AnyConnect Backup Servers: This feature allows the AnyConnect client to automatically connect to a backup server in case the primary server is unreachable or fails. The backup server list is configured on the ASA or IOS headend and pushed to the client during the VPN connection establishment. The client can also manually select a backup server from the list if needed. This feature enhances the availability and reliability of the VPN service for the clients12.
• ASA failover: This feature enables two identical ASAs to be paired together as an active/standby or active/active pair. The ASAs synchronize their configuration and state information and monitor each other’s health. If the active ASA fails or becomes unreachable, the standby ASA takes over the traffic and VPN sessions without any disruption for the clients. This feature provides high availability and redundancy for the VPN headend34.

1: AnyConnect Backup Servers 2: Redundancy options for IOS Headend for AnyConnect Clients 3: ASA Failover 4: AnyConnect Implementation and Performance/Scaling Reference for COVID-19 Preparation

The reason is that by default, the SSL VPN clients use split tunneling, which means they only send traffic destined for the corporate network through the VPN tunnel, and use their local gateway for other traffic, such as browsing the internet. This means that when they search for their IP address on a browser, they will see their local IP address, not the IP address of the ASA.

To change this behavior, you need to configure the Group Policy on the ASA to tunnel all networks, which means that all traffic from the SSL VPN clients will go through the VPN tunnel, regardless of the destination. This way, when they search for their IP address on a browser, they will see the IP address of the ASA, which is 3.3.3.3.

To configure tunnel all networks under Group Policy, you can use either ASDM or CLI. For example, using ASDM, you can follow these steps1:

• Choose Configuration > Remote Access VPN > Network (Client) Access > Group Policies.
• Select the group policy that you want to modify and click Edit.
• In the Edit Internal Group Policy window, choose Advanced > Split Tunneling.
• In the Policy drop-down list, choose Tunnel All Networks.
• Click OK and then Apply.

Using CLI, you can enter these commands:

ciscoasa(config)# group-policy attributes ciscoasa(config-group-policy)# split-tunnel-policy tunnelall

HSRP (Hot Standby Router Protocol). HSRP is a Cisco proprietary protocol that provides stateful failover for IPsec virtual private networks (VPNs). It is used to create a virtual router in order to provide redundancy in the event of an IPsec VPN failure. HSRP works by assigning a single primary router to manage the connection and forwarding traffic to the secondary router if the primary router fails.

one benefit of GET VPN is Simplified network design due to leveraging of native routing infrastructure (no overlay routing protocol needed) f mismatch is causing the problem with the IPsec VPN

The following table lists the commands that are enabled with the IKEv2 Smart Defaults feature, along with the default values.

Device# show crypto ipsec profile default

IPSEC profile default

Security association lifetime: 4608000 kilobytes/3600 seconds

Responder-Only (Y/N): N

PFS (Y/N): N

Transform sets={

default: { esp-aes esp-sha-hmac },

}

DMVPN stands for Dynamic Multipoint VPN, which is a technology that allows routers to dynamically form VPN tunnels with each other without requiring a pre-configured static crypto map. DMVPN uses Multipoint GRE (mGRE) interfaces and Next Hop Resolution Protocol (NHRP) to establish direct connections between routers. DMVPN has three phases of operation, each with different features and benefits.

DMVPN Phase 1 is the basic configuration, where all spokes are configured with a single mGRE interface that points to the hub as the NHRP server. The spokes can only communicate with the hub, not with each other. All traffic must go through the hub, which creates a bottleneck and increases latency.

DMVPN Phase 2 improves on Phase 1 by allowing spoke-to-spoke communication without going through the hub. This is achieved by using NHRP to dynamically resolve the IP address of the destination spoke and create a direct GRE tunnel between the spokes. However, this still requires the use of a dynamic routing protocol to advertise routes between the spokes, which adds overhead and complexity.

DMVPN Phase 3 further enhances Phase 2 by enabling spoke-to-spoke communication without requiring a dynamic routing protocol. This is done by using NHRP shortcut switching and NHRP redirect messages. When a spoke wants to send traffic to another spoke, it sends an NHRP resolution request to the hub, which responds with an NHRP redirect message containing the IP address of the destination spoke. The source spoke then creates a direct GRE tunnel with the destination spoke and switches the traffic to the new tunnel. The hub also sends an NHRP resolution reply to the destination spoke, informing it of the source spoke’s IP address. The destination spoke then creates a direct GRE tunnel with the source spoke and switches the traffic to the new tunnel. This way, the spokes can communicate directly without using a dynamic routing protocol or going through the hub.

Optimal Gateway Selection (OGS). OGS is a feature that can be used in order to determine which gateway has the lowest Round Trip Time (RTT) and connect to that gateway. One can use the OGS feature in order to minimize latency for Internet traffic without user intervention. With OGS, Cisco AnyConnect Secure Mobility Client (AnyConnect) identifies and selects which secure gateway is best for connection or reconnection. OGS begins upon first connection or upon a reconnection at least four hours after the previous disconnection.

The IKEv2 CREATE_CHILD_SA packet is used to establish a new security association (SA) between two peers. This packet contains the details of the exchange, including the traffic selectors, the cryptographic algorithms and keys to be used, and any other relevant information

KS (key server) is ‘caretaker’ of the GM group. Group registrations and authentication of GMs is taken care of by KS server. Any GM who wants to join the group is required to be successfully authenticated in the group and sends encryption keys and policy to be used within the group.

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Reverse route injection (RRI) is a method that dynamically installs the network routes for remote tunnel endpoints. The RRI feature allows the router to automatically learn the routes for the remote networks and automatically install these routes into the routing table. This eliminates the need for the administrator to manually configure and maintain the routes for the remote networks. This feature is commonly used in VPN environments, where the router at the VPN endpoint needs to learn the routes for the remote networks behind the other VPN endpoint. The other options such as policy-based routing, CEF, and route filtering are not used to dynamically install the network routes for remote tunnel endpoints

DMVPN disables the EIRGP next-hop-self with "no ip next-hop-self eigrp xxx" in DMVPN phase 2, and to go from Phase 2 to 3 you need use the NHRP protocol, and again enable EIRGP next-hop-self with "ip next-hop-self eigrp 134" under the tunnel interface

On a FlexVPN hub-and-spoke topology where spoke-to-spoke tunnels are not allowed, the command that is needed for the hub to be able to terminate FlexVPN tunnels is interface virtual-template. The interface virtual-template command is used to configure a virtual template interface which provides a secure tunnel for FlexVPN connections. The other commands listed - interface virtual-access, ip nhrp redirect, and interface tunnel - are not related to FlexVPN and are not used to terminate FlexVPN tunnels.