Which of the following problems are caused by routing loops? (Choose three)
A. Slow convergenceAccording to the following topology and configuration, R1 and R2 are connected through low-speed serial cables and PPP is used to encapsulate data link layer packets. When the Holdtime values of R1 and R2 are different, PPP negotiation and communication fail.

Following a failure of services in the network, an administrator discovered that the configuration in one of the enterprise routers had been changed. What actions can be taken by the administrator to prevent further changes? (Choose three)
A. The administrator should limit access by setting the login privilege of users to 0.The company has users who report that when using the network to transfer files, the speed is very low. The administrator found a packet in the network using Wireshark software to capture packets. Some duplicate frames, the following description of the possible causes or solutions is correct ().
A. When the switch cannot find the destination MAC address of the data frame in the MAC address table, the switch will flood the data frame.How can the default route be generated? (Choose all that apply.)
A. Manually configured.An administrator wishes to configure a floating static route. In order to successfully achieve this, which operation should be performed?
A. The administrator is required to configure a different preference values for the primary static route and floating static route.The correct description of GVRP below is ().
A. GVRP enables dynamic discovery and deletion of network devicesWhich of the following types of routes can be used by a router to establish a routing table?
A. Direct routeWhat is the main function of DHCP Discover packets?
A. The client sends DHCP Discover packets for requesting to confirm the configuration or renew the lease time of the IP address.As shown in the figure, the packet is encapsulated in IPsec VPN. Which type of packet is encapsulated in IPsec VPN?

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