Customer A wants a Layer 3 VPN between their two sites. To support this, you purchase a carrier- of-carriers solution from ISP2.Referring to the topology in the exhibit, how many labels does PE1 push onto data packets destined for PE2?
A.
1
B.
2
C.
3
D.
4
Howcome?? i think answer should be 2 labels… i will be glad if any one explain it…..
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One more label for carrier over carrier ……….
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Is there a technical document that explains the 3 labels? It seems like PE3 would add the additional label or labels?
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Thanks 🙂
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Hey seenagape, could you please update the questions…. Latest Actualtest have 171 QA……
please update guys…
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According to JMV course, for Carrier-of-Carriers option C, PE will send double labels only.
so the correct answer should be B.
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http://www.juniper.net/techpubs/en_US/junos10.2/information-products/topic-collections/config-guide-mpls-applications/topic-42327.html
Correct Answer is C. 3
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PE1 will send the traffic with two labels only but when CE1 forward it to PE3, CE1 will send with tree labels “so maximum labels in path will be three but PE1 just send two labels”
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Sorry, CE1 will also forward two labels to PE3, but PE3 will forward traffic with three labels to P3 side”
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I think the labels are 2 one for vpn and second rsvp/ldp.
The answer by ehsan is referring to ce1 that is the whole path.
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scrap my last response.
The labels are three.
1 vpn label
2 lsp to pe3
3 lsp to ce1
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2 lsp to pe2
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1. PE1 pushes 2 labels: CustA VPN label and transport label to CE1.
2. PE3 keeps original CustA VPN label and pushes 2 additional labels: ISP1 VPN label + transport label
3. PE4 keeps original CustA VPN label, pops ISP1 VPN label and transport label and pushes transport label to CE2
4. CE2 keeps original CustA VPN label, pops transport label, pushes transport label to PE2.
So the answer should be B.
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2 Labels only at the PE receiving Customer traffic
http://www.juniper.net/techpubs/en_US/junose15.1/topics/concept/layer-3-vpn-customer-carrier-vpn-service-provider-overview.html
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Correct Answer: C
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In CSC be default maximum three labels are needed but in the provider network, on PE1 only two labels are pushed, one for VPN and for transport.
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