Differences between static and dynamic routes on the USG2000 and USG5000 series

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Static routes are easy to configure, have low requirements on the system, and apply to simple, stable, and small networks. The disadvantage of static routes is that they cannot automatically adapt to network topology changes. Therefore, static routes require subsequent maintenance. Dynamic routing protocols have their routing algorithms. Therefore, dynamic routes can automatically adapt to network topology changes and apply to the networks on which Layer 3 devices are deployed. The configurations of dynamic routes are complex. Dynamic routes have higher requirements on the system than static ones and consume network resources and system resources.

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Differences between static and dynamic routes
The differences between static and dynamic routes are as follows: Static routes are easy to configure, have low requirements on the system, and apply to simple, stable, and small networks. The disadvantage of static routes is that they cannot automatically adapt to network topology changes. Therefore, static routes require subsequent maintenance. Dynamic routing protocols have their routing algorithms. Therefore, dynamic routes can automatically adapt to network topology changes and apply to the networks on which Layer 3 devices are deployed. The configurations of dynamic routes are complex. Dynamic routes have higher requirements on the system than static ones and consume network resources and system resources.

Differences between static and dynamic routes on the USG6000 series
Static routes are easy to configure, have low requirements on the system, and apply to simple, stable, and small networks. The disadvantage of static routes is that they cannot automatically adapt to network topology changes. Therefore, static routes require subsequent maintenance. Dynamic routing protocols have their routing algorithms. Therefore, dynamic routes can automatically adapt to network topology changes and apply to the networks on which Layer 3 devices are deployed. The configurations of dynamic routes are complex. Dynamic routes have higher requirements on the system than static ones and consume network resources and system resources.

Differences between dynamic BFD for IS-IS and static BFD for IS-IS on S series switches
The differences between dynamic BFD for IS-IS and static BFD for IS-IS are as follows: Dynamic BFD for IS-IS is triggered by upper-layer protocols. BFD sessions are dynamically established and link failures are detected based on BFD session status. Static BFD for IS-IS is manually configured to detect link failures.

Difference between the L2TP and the IPSec on the USG2000 and USG5000
The L2TP provides tunnel transmission support to data frames on the PPP link layer and allows L2 link terminations and PPP session points reside on different devices, thereby expanding the PPP model. That is, the L2TP establish a PPP link between a cross-LAC user and the LNS. The IPSec is an open network-layer security framework protocol, stipulated by the Internet Engineering Task Force (IETF). It is a series of protocols and services that provide IP network security. The IPSec mainly includes the Authentication Header (AH), Encapsulating Security Payload (ESP), Internet Key Exchange (IKE), and algorithms used for network authentication and encryption. The L2TP over IPSec mechanism encapsulates packets based on the L2TP and then the IPSec. In this way, the L2TP over IPSec mechanism integrates advantages of two types of VPNs, implements user authentication and address allocation based on the L2TP, and makes up the disadvantages of the IPSec in terms of user authentication and authorization.

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