The customer's network looks like this:
HostA----GE0/0--MSR-1--S1/0---------S1/0--MSR-2--GE0/0----HostB
The WAN interfaces on the two routers are configured as follows:
MSR-1:
firewall enable
acl number 3000
rule 0 deny ip source 192.168.0.0 0.0.0.255
rule 5 permit ip
interface Serial1/0
link-protocol ppp
firewall packet-filter 3000 outbound
ip address 6.6.6.2 255.255.255.0
MSR-2:
interface Serial1/0
link-protocol ppp
ip address 6.6.6.1 255.255.255.0
Assuming that the IP address of HostA is 192.168.0.2/24, and the routing and other related interface configurations are correct, then _______. (Multiple choice)

• A.Can ping HostA on MSR-2
• B.HostA can ping 6.6.6.2, but cannot ping 6.6.6.1
• C.HostA can't ping 6.6.6.2, and also can't ping 6.6.6.1
• D.HostA can ping 6.6.6.2, and it can also ping 6.6.6.1

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The Layer 2 Ethernet switch searches the MAC address table for an entry that matches the destination MAC address of the frame, thereby forwarding the frame from the corresponding interface. If the search fails, the switch will ______.

• A.Find fast forwarding table
• B.discard the frame
• C.Find routing table
• D.Send the frame from all other ports except the incoming port

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The correct statement about STP, RSTP and MSTP is ______. (Multiple choice)

• A.MSTP is compatible with RSTP, but not compatible with STP.
• B.RSTP is an optimized version of the STP protocol. The delay for the port to enter the forwarding state is greatly shortened under certain conditions, which shortens the time required for the network to finally reach topological stability.
• C.MSTP can make up for the shortcomings of STP and RSTP. It can not only converge quickly, but also enable the traffic of different VLANs to be forwarded along their respective paths, thereby providing a better load sharing mechanism for redundant links.
• D.MSTP cannot converge quickly. When the network topology changes, the originally blocked port needs to wait for a period of time before it becomes the forwarding state.

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What is wrong about the IP address below is ______. (Multiple choice)

• A.Address translation (NAT) technology is usually used to solve the conversion of class A addresses to class C addresses.
• B.The network number of the Class A IP address has 8 digits, and the actual variable number is 7 digits.
• C.The first octet of a class C IP address starts with 100.
• D.IP address consists of two parts: network number and host number.

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Which of the following statements about frame relay are correct?

• A.Configure Inverse ARP to automatically discover the DLCI address of the opposite router
• B.Frame Relay DTE equipment can query the status of the permanent virtual circuit on the interface through LMI
• C.Permanent virtual circuit is a virtual circuit that is automatically allocated through the protocol, and its creation / deletion does not require manual operation
• D.Frame relay network can realize the interconnection between multiple nodes, and can broadcast a frame to all nodes at once

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