Refer to the exhibit.As shown in the figure, CE 1 and CE 3 belong to VPN-A, and CE 2 and CE 4 belong to VPN-B. VPN-target of VPN-A is 111:1, and that of VPN-B is 222:2.Users on different VPNs are not allowed to access each other. Configuration principles are as follows:1. On the backbone network, if a PE is connected to a CE, VPN instances need to be configured on the PE, and an interface on the PE for connecting to the CE must be bound to a VPN instance. After binding an interface to a VPN instance, you must configure the IP address of the interface.Between PEs, IS-IS is configured for PE interworking, MPLS basic capabilities and MPLS LDP are configured for MPLS LSP establishment, and MP-IBGP is configured for VPN route exchange. LDP is short for Label Distribution Protocol, and IBGP is short for Interior Border Gateway Protocol.2. A CE exchanges VPN routes with a PE over External Border Gateway Protocol (EBGP). Which of the following configurations of PE 1 is incorrect? (A) (1) Configure Interior Gateway Protocol (IGP) on the IS-IS+MPLS backbone network to achieve the interworking between PEs and P routers.# Configure PE 1 as follows:[PE 1] isis 100[PE 1-isis-100] is-level level-2[PE 1-isis-100] network-entity 10.1234.1234.1234.00[PE 1] interface loopback1[PE 1-LoopBack1] ip address 1.1.1.9 32[PE 1-LoopBack1] isis enable[PE 1-LoopBack1] quit[PE 1] interface pos3/0/0[PE 1-Pos3/0/0] ip address 172.1.1.1 24[PE 1-Pos3/0/0] isis enable[PE 1-Pos3/0/0] quit(2) Configure MPLS basic capabilities and MPLS LDP for setting up LDP LSPs on the IS-IS+MPLS backbone network.# Configure PE 1 as follows:[PE 1] mpls lsr-id 1.1.1.9[PE 1] mpls[PE 1-mpls] lsp-trigger all[PE 1-mpls] quit[PE 1] mpls ldp[PE 1-mpls-ldp] quit[PE 1] interface pos 3/0/0[PE 1-Pos3/0/0] mpls[PE 1-Pos3/0/0] mpls ldp[PE 1-Pos3/0/0] quit(3) Configure VPN instances on a PE for connecting CEs to the PE.# Configure PE 1 as follows:[PE 1] ip vpn-instance vpna[PE 1-vpn-instance-vpna] route-distinguisher 100:1[PE 1-vpn-instance-vpna] vpn-target 111:1 both[PE 1-vpn-instance-vpna] quit[PE 1] ip vpn-instance vpnb[PE 1-vpn-instance-vpnb] route-distinguisher 100:2[PE 1-vpn-instance-vpnb] vpn-target 222:2 both[PE 1-vpn-instance-vpnb] quit[PE 1] interface gigabitethernet 1/0/0[PE 1-GigabitEthernet1/0/0] ip binding vpn-instance vpna [PE 1-GigabitEthernet1/0/0] ip address 10.1.1.2 24[PE 1-GigabitEthernet1/0/0] quit[PE 1] interface gigabitethernet 2/0/0[PE 1-GigabitEthernet2/0/0] ip binding vpn-instance vpnb [PE 1-GigabitEthernet2/0/0] ip address 10.2.1.2 24[PE 1-GigabitEthernet2/0/0] quit(4) Set up an EBGP peer relationship between a PE and a CE and import VPN routes.# Configure PE 1 as follows:[PE 1] bgp 100[PE 1-bgp] ipv4-family vpn-instance vpna[PE 1-bgp-vpna] peer 10.1.1.1 as-number 65410[PE 1-bgp-vpna] import-route direct[PE 1-bgp-vpna] quit[PE 1-bgp] ipv4-family vpn-instance vpnb[PE 1-bgp-vpnb] peer 10.2.1.1 as-number 65420[PE 1-bgp-vpnb] import-route direct[PE 1-bgp-vpnb] quit(5) Set up an MP-IBGP peer relationship between PEs.# Configure PE 1 as follows:[PE 1] bgp 100[PE 1-bgp] peer 3.3.3.9 as-number 100[PE 1-bgp] peer 3.3.3.9 connect-interface loopback 1[PE 1-bgp] ipv4-family vpnv4[PE 1-bgp-af-vpnv4] peer 3.3.3.9 enable[PE 1-bgp-af-vpnv4] quit
Answer(s): B
Refer to the exhibit.As shown in the figure, RTA belongs to AS 100 and has an EBGP neighbor relationship with RTB. RTB, RTC, RTD, RTE, and RTF belong to AS 200.RTB, RTD, and RTE are assigned to AS65001, RTC to AS65002, and RTF to AS65003.1. When route 1.1.1.1/32 is imported from RTA, what is the AS_Path attribute of this route to be advertised to RTF?2. When route 1.1.1.1/32 is imported from RTC, what is the AS_Path attribute of this route to be advertised to RTA?3. When route 1.1.1.1/32 is imported from RTC, what is the AS_Path attribute of this route to be advertised to RTE?The attributes are as follows:
Answer(s): A
BGP often uses AS PATH to control inter-area routes. Which of the following regular expressions helps ensure that routes within AS 100 and neighboring ASs are received from only one EBGP neighbor?
Answer(s): C
Two BGP routes with the same prefix are received from two peers. The two routes have the same attributes except the next hop (NH1 and NH2).NH1 is iterated to the directly connected A and B, NH2 to directly connected C and D. If maximum load-balancing2 is configured in BGP and a router can be configured with a maximum of six paths for load balancing, how many paths does a forward information base (FIB) generate regarding this prefix?
Answer(s): D
Which of the following is the maximum length of the Ethernet frame encapsulated by QinQ?
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