An enterprise network is shown in the figure. If CE2 is dual-owned by PE2 and PE3, a Type 3 LSA routing loop may occur. The loop can be prevented by setting the dn-bit-set disable command on PE2 and PE3 devices.

On the network shown in the figure, OSPF is deployed on R1 and R2. IS-IS is deployed on R2 and R3. To enable R1 to obtain the route to 10.0.3.3/32, ISIS routes are imported into OSPF on R2. In this case, the next hop address to 10.0.3.3/32 in the routing table of R1 is_____.

In order to protect the BGP protocol from attacks, MDS authentication can be used between BGP neighbors to reduce the possibility of attacks. The ID5 algorithm is simple to configure. After configuration, a single password is generated, and human intervention is required to change the password.

The networks of large and medium-sized enterprises can be divided into access layer, aggregation layer and core layer. Network engineers need to formulate cutover plans for any operations performed at any layer that affect the existing network services.

An enterprise network is shown in the figure. If CE2 is dual-owned by PE2 and PE3, a Type 5 LSA routing loop may occur. The loop can be prevented by setting the route-tag command on PE2 and PE3 devices. When the Route Tag of the route received by PE3 is the same as the local configuration, the route will be ignored.