What technique should be used on BGP edge routers to prevent

第1题：

第2题：

When implementing MPLS VPNs between CE and PE routers, which of these statements is correct? As a Network Engineer, it is necessary for you to know how to implement MPLS VPNs between Customer Edge and Provider Edge routers. Refer to the following descriptions, which one is making sense?（）

• A、If using OSPF or EIGRP as the PE-CE routing protocol, redistribution is not required, but any other protocol or static route will require redistribution
• B、If using IS-IS as the PE-CE routing protocol, no redistribution is required
• C、If using static routes between the CE and PE routers, no redistribution of other VPN routes is required
• D、If PE-CE protocol is not BGP, redistribution of other VPN routes from MP-BGP is required

第3题：

第4题：

What technique should be used on BGP edge routers to prevent a multi - homed autonomous system from becoming a trans it system?（）

• A、Advertise with a high MED value all networks that are discovered via external BGP.
• B、Set the no - export community attribute on all networks that are advertised externally.
• C、Remove the AS - Path information on all routes in the BGP table pr ior to advertising externally.
• D、Set the origin code to incomplete for all networks that are discovered via external BGP.
• E、Only advertise networks externally if they have been discovered via internal BGP.
• F、Use an outgoing distribution list to filte r all networks not originating from inside the autonomous system.

第5题：

Which BGP community is used to prevent the advertisement of the BGP prefix to other BGP peers？（）

• A、additive
• B、none
• C、no-export
• D、no-advertise
• E、local-as

第6题：

If the OSPF protocol is used to connect customer edge （CE） routers to service provider edge（PE） routers in the VPN backbone， which two options best describe the use of SHAM links？（）

• A、A sham-link is created between any twoo VPN sites that belong to the same OSPF area and share an OSPF backdoor link
• B、A sham-link is seen as an intra-area link between PE routers，an OSPF adjacency is created and data base is exchanged
• C、A SHAM link is created between two directly connected PE routers so that it is preferred over the low speed backdoor door
• D、A SHAM link is part of OSPF network of MPLS-VPN provider

第7题：

Which BGP attribute is used by BGP to prevent routing loops?（）

• A、AS - path
• B、next - hop
• C、MED
• D、weight
• E、local preference
• F、origin

第8题：

第9题：

What is the purpose of configuring router R1 with the "IP Helper address" command？（）

• A、IP Helper is used to direct BOOTP clients to a BOOTP server
• B、IP Helper is used to prevent the router form forwarding IP broadcasts
• C、IP Helper is used to allow IPX clients to communicate with IP-based servers
• D、IP Helper is used to accommodate compatibility routers using different IP routing protocols
• E、None of the other alternatives apply

第10题：

What is true regarding Autonomous Systems （AS ）？（）

• A、AS numbers are assigned by the IANA
• B、AS numbers are used by BGP （Border Gateway protocol ） to exchange IP routing information with neighboring AS
• C、In the internet， an Autonomous System （AS） is a collection of IP networks and routers under the control
• D、All of the Above