Download Implementing Cisco Service Provider Next-Generation Egde Network Services.642-889.ExamTopics.2025-09-17.14q.tqb

Vendor: Cisco
Exam Code: 642-889
Exam Name: Implementing Cisco Service Provider Next-Generation Egde Network Services
Date: Sep 17, 2025
File Size: 97 KB
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Demo Questions

Question 1
On Cisco IOS XR platforms using the EVC infrastructure, which command is used to enable a Layer 2 VPN subinterface?
  1. interface gi0/0/0/0.10 switchport access vlan 10
  2. interface gi0/0/0/0.10 switchport mode tunnel dot1q-tunnel
  3. interface gi0/0/0/0.10 switchport mode trunk
  4. interface gi0/0/0/0.10 bridge-group 10 E.
Correct answer: D
Question 2
In which Cisco IOS XR configuration mode is the redistribute static command applied to enable the redistribution of static VRF routes between the PE routers?
  1. RP/0/RP0/CPU0:PE(config-router)#
  2. RP/0/RP0/CPU0:PE(config-bgp)# C. D.
Correct answer: B
Question 3
What is required on a Cisco IOS XR router to assign an interface to a VRF?
  1. Assign the VRF to the interface, and then re-enable Cisco Express Forwarding on the interface.
  2. Assign the VRF to the interface, and then reset the CE-to-PE routing protocol process.
  3. Shut the interface, assign the VRF to the interface, and then no shut the interface. D.
Correct answer: C
Question 4
Which VPN technology is an example of a full-mesh VPN?
  1. VTI
  2. GRE VPN
  3. Frame Relay L2 VPN D.
Correct answer: C
Question 5
When is it appropriate to activate the VPNv6 address family?
  1. when implementing 6PE
  2. when running dual stack at the provider edge
  3. when implementing 6to4 tunneling D.
Correct answer: C
Question 6
Which Cisco IOS XR BGP configuration command is required to enable MP-BGP to carry IPv6 VPN routes?
  1. address-family ipv4 unicast
  2. address-family ipv6 unicast
  3. address-family vpnv4 unicast D.
Correct answer: C
Question 7
When implementing MPLS Layer 3 VPNs with customers running OSPF as the CE-PE routing protocol, which situation will require a sham link to be implemented in the MPLS backbone?
  1. to connect customer sites in different OSPF areas
  2. to connect customer sites in the same OSPF area
  3. to prevent OSPF routing loops when a customer site has redundant CE-PE connections D.
Correct answer: C
Question 8
In which configuration mode is a route distinguisher configured in a Cisco IOS XR router?
  1. config-vrf
  2. config-vrf-af
  3. config-bgp
  4. config-bgp-af E.
Correct answer: D
Question 9
Which Layer 2 VPN technology is implemented over an IP core network without the need for MPLS?
  1. VPLS
  2. VPWS
  3. AToM D.
Correct answer: C
Question 10
Which two Layer 2 VPN methods support interworking between customer sites with different Layer 2 encapsulation at each end (for example, Frame Relay to Ethernet interworking)? (Choose two.)
  1. AToM
  2. VPLS
  3. GET VPN D.
Correct answer: AC
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