This quiz assesses knowledge on Layer 3 VPN configurations, focusing on roles of CE and PE routers, supported routing protocols, and MPLS reachability. It's designed for learners to understand single homed, multihomed environments and routing dynamics in VPN setups.
Site ID
Policies
Circuit ID
Extended Communities
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An extended community for layer 3 VPNs only
Avoids a MP-BGP session to be cleared after changes are made to the VPN membership.
Used to carry OSPF Metric values
Used with VRF import / export policies
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Assign an MPLS label for the routes.
Forward traffic using MPLS labels.
Advertise routes from a site to the provider network.
Receive routes from the provider network about remote sites.
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Not an OSPF feature
Carries OSPF routes across backbone as BGP routes
VRF import
Security feature
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1
2
3
4
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Backbone OSPF routes
L3VPN domain routes
Routes received from directly connected CE sites
Routes received from other PE routers with acceptable MP-BGP attributes
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Circuit ID
VPN label
Route target
Route distinguisher
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Family inet unicast
Family inet any
Family inet-vpn unicast
Family inet-vpn vpn-nlri
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OSPF
BGP
IS-IS
RIP
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Allows for route-leaking
Only used on ASBR
Allows an administrator control LSA translation
None of the above
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VRF policy
OSPF tag
BGP extended community attributes
BGP local preference
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Maintain VPN specfic forwarding tables
Perform label switching
Forward VPN data transparently over established LSPs
Exchange VPN routing information with other PE routers
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The default OSPF domain-id is 127.0.0.1
In most cases, a domain-id must be configured
In most cases, you don’t need to configure a domain-id
For a layer 3 VPN connecting multiple OSPF domains, configuring a domain-id can help control LSA translation.
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16 bits
18 bits
20 bits
24 bits
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Path flow
Control flow
Label Flow
Data flow
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As-loops
As-override
Local-as
Peer-as
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Mask, Route Distinguisher, MPLS Label, IP Prefix
Mask, MPLS Label, Route Distinguisher, IP Prefix
MPLS Label, Route Distinguisher, Mask, IP Prefix
Route Distinguisher, MPLS Label, Mask, IP Prefix
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Route type
Domain ID
VPN route tag
Route origin
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Type 2
Type 1
Type 3
Type 0
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Vrf-import target:64512:1234
Vrf-export target:64512:1234
Vrf-target target:64512:1234
Vrf-route-target target:64512:1234
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By implementing unique RDs for each customer
By implementing unique RTs for each customer
By implementing different LSPs for each customer
By implementing virtual routing spaces for each customer
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The BGP next hop must be in inet.1
The BGP next hop must be in inet.3
Must have a bidrectional LSP configured
Must have a static route configured to allow an RP for connected interfaces
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