Which of the following transition technologies are tunnel technologies?

• A.6PE
• B.Dual stack
• C.NAT-PT
• D.6to4
• E.ISATAP

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The default priority value for OSPF external routes is ________.

• A.150
• B.100
• C.10
• D.255

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The networking is shown in the figure. RTA and RTB are located in AS 1001, RTC, RTD, and RTE are located in AS 1002. AS 1001 advertises BGP routes 11.11.11.0/24 to AS 1002. The main BGP configurations of RTC and RTD are as follows, if RTE , RTC's interconnection link is interrupted, RTE visits the 11.11.11.0/24 network segment, which wide area link is the priority to go through?
RTC]
bgp 1002
preference 20 170 200
peerRTA as-number 1001
peerRTD as-number 1002
peerRTA route-policsetmed import
route-policsetmed permit node 10
applcost 100
RTD]
bgp 1002
preference 20 170 200
peerRTB as-number 1001
peerRTC as-number 1002
peerRTA route-policsetmed import
route-policsetmed permit node 10
applcost 200

• A.Pass WAN link 2 first, because eBGP routing on RTD takes precedence.
• B.Pass through wide area link 1 first, because RTC's MED 100 is less than RTD's MED 200
• C.Pass through WAN link 1 first, because eBGP routing on RTC is preferred.
• D.Pass WAN link 2 first, because RTD MED 200>RTC MED 100.

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Running the command on the router and its display information is as follows:
<RTC>displisis lsdb level-1 verbose
Database information for ISIS(1)
--------------------------------
Level-1 Link State Database
LSPID Se Num Checksum Holdtime Length ATT/P/OL
-------------------------------------------------- -----------------------------
3333.3333.3333.00-00* 0x0000007c 0x5fae 388 58 1/0/0
SOURCE 3333.3333.3333.00
NLPID IPV4
AREA ADDR 02
INTF ADDR 10.1.3.2
INTF ADDR 10.3.4.1
NBR ID 4444.4444.4444.00 COST: 10
3333.3333.3333.00-01* 0x0000008f 0x55ae 388 113 0/0/0
SOURCE 3333.3333.3333.00
IP-Internal 10.1.3.0 255.255.255.252 COST: 10
IP-Internal 10.3.4.0 255.255.255.252 COST: 10
IP-Internal* 172.16.3.1 255.255.255.255 COST: 10
IP-Internal* 10.1.2.0 255.255.255.252 COST: 20
IP-Internal* 192.168.18.0 255.255.255.0 COST: 30
IP-Internal* 172.16.2.1 255.255.255.255 COST: 20
IP-Internal* 172.16.1.1 255.255.255.255 COST: 20
4444.4444.4444.00-00 0x00000111 0x9817 1098 62 1/0/0
SOURCE 4444.4444.4444.00
NLPID IPV4
AREA ADDR 02
INTF ADDR 10.3.4.2
INTF ADDR 10.2.4.2
INTF ADDR 172.16.4.1
NBR ID 3333.3333.3333.00 COST: 10
4444.4444.4444.00-01 0x0000006f 0x8952 1098 65 0/0/0
SOURCE 4444.4444.4444.00
IP-Internal 10.3.4.0 255.255.255.252 COST: 10
IP-Internal 10.2.4.0 255.255.255.252 COST: 10
IP-Internal 172.16.4.1 255.255.255.255 COST: 0
From the above information, we can know that __________.

• A.The area number of RTC is 02
• B.Address 10.3.4.2 belongs to router with Stem-ID 4444.4444.4444
• C.The router with Stem-ID 3333.3333.3333 carries a total of 7 pieces of Level-1 IP internal reachable routing information
• D.RTC's Stem-ID is 4444.4444.4444

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In the IS-IS network as shown in the figure, RTA, RTC, RTD, and RTE establish a Level-2 adjacency relationship with each other; RTB, RTA, and RTC establish a Level-1 adjacency relationship. After the reason of each router is stable, when RTB accesses 192.168.5.1, it chooses the next hop as ______.
If RTA adds the following configuration at this time:
RTA-isis-1]import-route isis level-2 into level-1
Then when RTB accesses 192.168.5.1 again, choose the next hop as ______.

• A.RTC; RTC
• B.RTC; RTA
• C.RTA; RTA
• D.RTA; RTC

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