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CCNP Security VPN Quick Reference [Book]
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Item s unavailable for purchase. Please review your cart. You can remove the unavailable item s now or we'll automatically remove it at Checkout. Remove FREE. Unavailable for purchase. Continue shopping Checkout Continue shopping. You are in the Greece store Not in Greece? Choose Store. Secure Vault or Cache Cleaner is downloaded and started. The user authenticates. DAP checks are applied. The VPN tunnel becomes active. Post-session cleanup occurs at VPN termination.
This means that each site spoke can connect directly with all other sites, no matter where they are located. When two spokes are required to exchange data between each other -- for a VoIP telephone call, for example -- the spoke will contact the hub, obtain the necessary information about the other end, and create a dynamic IPsec VPN tunnel directly between them. Mohamed Abou Elenein administrative burden and provide reliable dynamic connectivity between sites.
Generic Routing Encapsulation GRE is a tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol network. This function is called NHRP registration.
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Note If router R2 want sent packet to R4 or Mohamed Abou Elenein ip add Mohamed Abou Elenein ip route Mohamed Abou Elenein ip nhrp map multicast dynamic ip nhrp map multicast R1 Hub crypto isakmp policy 5 8. Mohamed Abou Elenein hash sha authentication pre-share group 14 lifetime encryption aes exit crypto isakmp key cisco address 0.
Mohamed Abou Elenein Troubleshoot DMVPN sh ip nhrp sh int tunnel 0 sh run tunnel 0 sh ip route sh ip rout eigrp sh ip eigrp neighbor logging buffered 7 logging console 7 sh crypto isakmp policy show crypto isakmp sa sh crypto ipsec sa sh dmvpn details dubug crypto isakmp IKE call admission control Internet Key Exchange IKE or IKEv2 is the protocol used to set up a security association SA in the IPsec protocol suite. IKE uses X. In addition, a security policy for every peer which will connect must be manually maintained.
IKEv1 Phases IKE phase 1's purpose is to establish a secure authenticated communication channel by using the Diffie—Hellman key exchange algorithm to generate a shared secret key to encrypt further IKE communications. The authentication can be performed using either pre-shared key shared secret , signatures, or public key encryption.
Phase 1 operates in either Main Mode Mohamed Abou Elenein or Aggressive Mode. Main Mode protects the identity of the peers; Aggressive Mode does not. The negotiation results in a minimum of two unidirectional security associations one inbound and one outbound. Phase 2 operates only in Quick Mode.
IKEv1 vs. Its responsibility is in setting up security associations that allow two parties to send data securely. IKE was introduced in and was later superseded by version 2 roughly 7 years later. Freeing up bandwidth is always a good thing as the extra bandwidth can be used for the transmission of data. EAP is essential in connecting with existing enterprise authentication systems.
This is when a router captures the packets sent and modifies the destination address on the packets.
This is typical when multiple users are using the same Internet connection thus giving them the same IP address. This is not a problem with ordinary activities like browsing but can be a significant problem when IPsec is needed.
If the liveness check fails, caused by the tunnel breaking down, IKEv2 is then able to re-establish the connection automatically. IKEv1 does not have this ability and would just assume that the connection is always up thus having quite an impact on reliability. There are several workarounds for IKEv1, but these are not standardized. Summary: 1. VTIs support native IPsec tunneling, including interoperability with standards-based IPsec implementations of other vendors.
Otherwise, static VTI tunnels are recommended. Static or dynamic routing protocol over the VTI tunnels: Dynamic routing protocols should be used in large networks or to provide redundancy with multiple VTI tunnels. Otherwise, static routing over VTI tunnels is recommended. There are eight default policies with priorities ranging from to , with having the highest priority and having the lowest priority.
Key Ring with PSKs 3. Mohamed Abou Elenein network 2. Customers often have to learn different types of VPNs to manage and operate different types of network. And once a technology is selected for a deployment, migrating or adding functionality to enhance the VPN is often avoided. FlexVPN was created to simplify the deployment of VPNs, to address the complexity of multiple solutions, and as a unified ecosystem to cover all types of VPN: remote access, teleworker, site to site, mobility, managed security services, and others.
See Figure IKEv2-based dynamic route distribution and server clustering. If the transport network supports native IP Multicast, the FlexVPN hub router can choose to have the transport network do multicast packet replication after IPsec encryption available in the future. Per tunnel QoS dynamically applied to direct traffic between spokes available in the future. Mohamed Abou Elenein description This describes R6 address What Is SSL? SSL Secure Sockets Layer is a standard security technology for establishing an encrypted link between a server and a client—typically a web server website and a browser; or a mail server and a mail client e.
Mohamed Abou Elenein SSL allows sensitive information such as credit card numbers, social security numbers, and login credentials to be transmitted securely.
CCNP Security (300 Series) Guide Books, Student Guides, and Study Material
Normally, data sent between browsers and web servers is sent in plain text—leaving you vulnerable to eavesdropping. If an attacker is able to intercept all data being sent between a browser and a web server they can see and use that information. More specifically, SSL is a security protocol.
Protocols describe how algorithms should be used; in this case, the SSL protocol determines variables of the encryption for both the link and the data being transmitted. Internet users have come to associate their online security with the lock icon that comes with an SSL-secured website or green address bar that comes with an extended validation SSL-secured website.