L3 VPN( Single Homed, Multihomed, Static Routing, RIP, OSPF, Bgp, Vrrp)
By IMS Asia (https://www. Imsasia. Com)
- 1.In a Layer 3 VPN, what are the roles of the CE router? (choose two)
- A.
Assign an MPLS label for the routes.
- B.
Forward traffic using MPLS labels.
- C.
Advertise routes from a site to the provider network.
- D.
Receive routes from the provider network about remote sites.
- 2.In a Layer 3 VPN environment using RSVP for MPLS reachability, how many labels are placed on a data packet by the ingress PE router?
- A.
1
- B.
2
- C.
3
- D.
4
- 3.What routing protocol is not supported between the a PE router and CE router?
- A.
OSPF
- B.
BGP
- C.
IS-IS
- D.
RIP
- 4.PE1 has connections to VPN sites that are served by three remote PE routers. How many LSPs must be established to support rfc 4364?
- A.
An LSP for each local CE device
- B.
An LSP for each remote PE device
- C.
An LSP for each remote CE device
- D.
An LSP for each CE facing interface
- 5.Which condition must be met to allow a PE router to forward VPN traffic across a LSP in a layer 3 VPN environment?
- A.
The BGP next hop must be in inet.1
- B.
The BGP next hop must be in inet.3
- C.
Must have a bidrectional LSP configured
- D.
Must have a static route configured to allow an RP for connected interfaces
- 6.In a Layer 3 VPN, what are the roles of the PE router? (choose two)
- A.
Maintain VPN specfic forwarding tables
- B.
Perform label switching
- C.
Forward VPN data transparently over established LSPs
- D.
Exchange VPN routing information with other PE routers
- 7.What routes are housed in a VRF table? (choose two)
- A.
Backbone OSPF routes
- B.
L3VPN domain routes
- C.
Routes received from directly connected CE sites
- D.
Routes received from other PE routers with acceptable MP-BGP attributes
- 8.What is the correct order for the fields in a VPN-IPv4 NLRI?
- A.
Mask, Route Distinguisher, MPLS Label, IP Prefix
- B.
Mask, MPLS Label, Route Distinguisher, IP Prefix
- C.
MPLS Label, Route Distinguisher, Mask, IP Prefix
- D.
Route Distinguisher, MPLS Label, Mask, IP Prefix
- 9.In a Layer 3 VPN environment using OSPF between the PE and CE routers, what attribute is always advertised to the remote PE router?
- A.
Route type
- B.
Domain ID
- C.
VPN route tag
- D.
Route origin
- 10.Which two statements are true when configuring a domain-id? (Choose two)
- A.
The default OSPF domain-id is 127.0.0.1
- B.
In most cases, a domain-id must be configured
- C.
In most cases, you don’t need to configure a domain-id
- D.
For a layer 3 VPN connecting multiple OSPF domains, configuring a domain-id can help control LSA translation.
- 11.When a CE and PE router are exchanging routes via EBGP sessions, which JUNOS software command on the PE router is useful for ensuring that the advertised routes are received by the CE routers?
- A.
As-loops
- B.
As-override
- C.
Local-as
- D.
Peer-as
- 12.How many bits is use for the VRF label associated with the Layer 3 VPN NLRI?
- A.
16 bits
- B.
18 bits
- C.
20 bits
- D.
24 bits
- 13.What are the two Route Distinguisher Types defined?
- A.
Type 2
- B.
Type 1
- C.
Type 3
- D.
Type 0
- 14.What controlles the PE-PE Route Distribution? (choose two)
- A.
VRF policy
- B.
OSPF tag
- C.
BGP extended community attributes
- D.
BGP local preference
- 15.What is the OSPF Domain-ID used for?
- A.
Allows for route-leaking
- B.
Only used on ASBR
- C.
Allows an administrator control LSA translation
- D.
None of the above
- 16.Which JUNOS software command automatically assigns a route target of target:64512:1234 to routes in a particular Layer 3 VRF table?
- A.
Vrf-import target:64512:1234
- B.
Vrf-export target:64512:1234
- C.
Vrf-target target:64512:1234
- D.
Vrf-route-target target:64512:1234
- 17.Which JUNOS software configuration command allows PE routers to exchange routes in a Layer 3 VPN environment?
- A.
Family inet unicast
- B.
Family inet any
- C.
Family inet-vpn unicast
- D.
Family inet-vpn vpn-nlri
- 18.Which two mechanisms control route distribution between PE routers in an rfc 4364 VPN? (choose two)
- A.
Site ID
- B.
Policies
- C.
Circuit ID
- D.
Extended Communities
- 19.Which three attributes are advertised to the remote PWE and BGP-based VPNs? (choose three)
- A.
Circuit ID
- B.
VPN label
- C.
Route target
- D.
Route distinguisher
- 20.In which two ways do MPLS layer3 VPNs support overlapping customer address spaces?
- A.
By implementing unique RDs for each customer
- B.
By implementing unique RTs for each customer
- C.
By implementing different LSPs for each customer
- D.
By implementing virtual routing spaces for each customer
- 21.What are the two flows associated with RFC 4364 control information? (choose two)
- A.
Path flow
- B.
Control flow
- C.
Label Flow
- D.
Data flow
- 22.What is the functionality of a OSPF Sham link?
- A.
Not an OSPF feature
- B.
Carries OSPF routes across backbone as BGP routes
- C.
VRF import
- D.
Security feature
- 23.What is BGP Route refresh?
- A.
An extended community for layer 3 VPNs only
- B.
Avoids a MP-BGP session to be cleared after changes are made to the VPN membership.
- C.
Used to carry OSPF Metric values
- D.
Used with VRF import / export policies
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