Regarding the composition of the ISDN network, the correct statement below is ______.

• A.ISDN terminal and terminal adapter form the user side of ISDN network.
• B.ISDN switches are usually devices on the ISDN user side.
• C.ISDN terminal can be an ISDN telephone.
• D.The ISDN network is composed of ISDN terminals, terminal adapters, network terminal equipment, ISDN access routers, and ISDN switches.

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The following statement about frame relay address mapping is correct ______. (Multiple choice)

• A.Frame relay address mapping can be dynamically maintained using Inverse ARP.
• B.Frame relay address mapping is to associate the DLCI of the local device with the DLCI of the opposite device.
• C.Frame relay address mapping can be manually configured.
• D.When carrying the IP protocol, frame relay address mapping is used to associate the next hop IP address with the local DLCI.

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The messages exchanged between the DHCP relay and the DHCP server use ______.

• A.broadcast
• B.anycast
• C.unicast
• D.multicast

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An empty MSR router RTA connects two routers RTB and RTC running in OSPF Area 0 through GE0/0 and GE1/0 respectively. The IP addresses of the interfaces GE0/0 and GE1/0 of RTA are 192.168.3.2/24 and 192.168.4.2/24 respectively. Add the following configuration on RTA:
[MSR-ospf-1] area 0.0.0.0
[MSR-ospf-1-area-0.0.0.0]network 192.168.0 0.0.3.255
[MSR-GigabitEthernet0/0]ospf cost 2
[MSR-GigabitEthernet1/0]ospf dr-priority 0
Then the correct description of the above configuration is _____. (Multiple choice)

• A.This configuration only enables OSPF on the GE0/0 interface of the MSR router
• B.RTA may become the DR of the network segment where the two GE interfaces are located
• C.Modifying the Cost of interface GE0/0 does not affect the establishment of OSPF adjacency
• D.This configuration has enabled OSPF on GE0/0 and GE1/0 of the MSR router
• E.RTA can only become the DR of the network segment where one of the GE interfaces is located

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Execute the following configuration commands on the router:
[Router] dhcp enable
[Router] server forbidden-ip 192.168.1.10
[Router] server forbidden-ip 192.168.1.254
[Router] dhcp server ip-pool 0
[Router-dhcp-pool-0] network 192.168.1.0 mask 255.255.255.0
[Router-dhcp-pool-0] gateway-list 192.168.1.254
[Router-dhcp-pool-0] dns-list 192.168.1.10
[Router-dhcp-pool-0] expired day 5
After completing the above configuration, which of the following statements are correct? (multiple choice)

• A.The router has a DHCP relay function
• B.There are 252 addresses that the router can assign to the host
• C.The router has a DHCP server function
• D.The host can obtain the DNS server address 192.168.1.10 from the router through the DHCP service

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