The following statement about STP is correct. ______. (Multiple choice)

• A.STP can activate the blocked redundant backup link to restore network connectivity when the current active path fails
• B.STP eliminates possible path loops in the network by blocking redundant links in the network
• C.In a complex network, STP consumes a lot of processing resources, causing the network to fail to work normally.
• D.STP information transfer is realized by transferring BPDUs between bridges running STP

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PPP has to go through a series of negotiation processes before establishing a link. The correct negotiation sequence is ______.

• A.NCP>LCP>PAP/CHAP
• B.LCP> NCP>PAP/CHAP
• C.LCP>PAP/Chap>NCP
• D.PAP/CHAP>LCP>NCP

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A network connection is like:
HostA----GE0/0--MSR-1--S1/0---------S1/0--MSR-2--GE0/0----HostB
Two MSR routers MSR-1 and MSR-2 are interconnected back-to-back through their S1/0 interfaces, and their GE0/0 interfaces are respectively connected to the client hosts HostA and HostB. The IP address of HostA is 192.168.0.2/24, and the address of the S0/0 interface of MSR-2 is 1.1.1.2/30. By configuring other relevant IP addresses and routes, HostA can communicate with HostB in the current network.
Nowadays, the customer requires that HostA is not allowed to log in to the MSR-2 through Telnet at address 1.1.1.2.
So which of the following configurations can meet this requirement? (multiple choice)

• A.Configure the following ACL on MSR-1 and apply it to the outbound direction of GE0/0 of MSR-1: [MSR-1]firewall enable [MSR-1]acl number 3000 [MSR-1-acl- adv-3000]rule 0 deny tcp source 192.168.0.2 0 destination 1.1.1.2 0 destination-port eq telnet
• B.Configure the following ACL on MSR-1 and apply it to the outbound direction of S1/0 of MSR-1: [MSR-1]firewall enable [MSR-1]acl number 3000 [MSR-1-acl- adv-3000]rule 0 deny tcp source 192.168.0.2 0 destination 1.1.1.2 0.0.0.3 destination-port eq telnet
• C.Configure the following ACL on MSR-1 and apply it to the inbound direction of S1/0 of MSR-1: [MSR-1]firewall enable [MSR-1]acl number 3000 [MSR-1-acl- adv-3000]rule 0 deny tcp source 192.168.0.1 0.0.0.255 destination 1.1.1.2 0 destination-port eq telnet
• D.Configure the following ACL on MSR-1 and apply it to the inbound direction of GE0/0 of MSR-1: [MSR-1]firewall enable [MSR-1]acl number 3000 [MSR-1-acl-adv -3000]rule 0 deny tcp source 192.168.0.1 0.0.0.255 destination 1.1.1.2 0.0.0.3 destination-port eq telnet

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The Serial 0/0 and Serial 0/1 interfaces of the router of the Shenzhen branch of XYZ Company are connected to two different ISPs through two WAN lines. Both of these ISPs can visit the website of the Beijing head office at 202.102.100.2.
The following static routes are configured on the routers of the Shenzhen branch:
ip route-static 202.102.100.2 24 Serial 0/0
ip route-static 202.102.100.2 24 Serial 0/1
So which of the descriptions of these two routes is correct? (multiple choice)

• A.The traffic to Beijing can achieve load sharing through these two routes
• B.Only the first route will be written in the router's routing table
• C.Only the second route will be written in the router's routing table
• D.The two routes to Beijing can back up each other

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The routers MSR-1 and MSR-2 are interconnected through their respective GigabitEthernet0/0, and RIP is running between the two routers. At present, RIP has correctly completed remote routing learning. Now you can see the following in the routing table of MSR-1 The routing information:
Destination/Mask Proto Pre Cost NextHop Interface
2.0.0.0/24 RIP 100 15 100.1.1.1 GE0/0
6.0.0.0/8 RIP 100 1 100.1.1.1 GE0/0
Then based on this information, ______ can be inferred.

• A.The cost of the route whose network segment of the first entry is 2.0.0.0/24 has reached the maximum value and is an invalid route
• B.The route whose network segment of the first entry is 2.0.0.0/24 is still a valid route
• C.It can be confirmed that RIPv2 is running between the two routers
• D.It can be confirmed that RIPv1 is running between the two routers

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