Share some CCIE 400-201 exam questions and answers below.
How does BGPsec protect advertisements by preventing from the malicious traffic flows?
A. It validates the AS path
B. It validates only the originating AS
C. It validates routes with encryption
D. It validates the next-hop AS
Answer: A
A content provider uses ISP-A and ISP-B for Internet transit service for the purpose of redundancy and load balancing. The content provider has one address range assigned to it.
Which two techniques achieve the load balancing and redundancy for inbound traffic? (Choose two)
A. BGP Local-preference attribute
B. BGP MED attribute
C. Use ISP-A for outbound traffic and ISP-B for inbound traffic
D. BGP AS-prepend technique
E. Address range split into two more specific prefixes, then advertise one specific prefix per ISP
F. Aggregate all prefixes received from both ISPs into a less-specific prefix
Answer: D, E
Which two BGP mechanisms solve the full-mesh paradigm? (Choose two)
A. Confederation
B. Router policy filtering
C. Hierarchical VPLS
D. MPLS VPN
E. Route reflectors
F. BGP link state
G. Community SOO
Answer: A, E
A service provider engineer enabled the BGP next-hop tracking feature and also tuned the OSPF to increase the network convergence in case of network failures. However, the operator engineer notices that in cases of PE failure, the network convergence is still slow.
Which configuration must the operator use to remedy this failure scenario?
A. router bgp 65000
address-family ipv4
bgp nexthop trigger delay 1
!
address-family vpnv4
bgp nexthop trigger delay 1
B. ip prefix-list PREFIX_32 permit 0.0.0.0/0 ge 32
!
route-map ONLY_32 permit 10
match ip address prefix-list PREFIX_32
match source-protocol ospf
!
router bgp 65000
address-family vpnv4
bgp next-hop route-map ONLY_32
C. router ospf 1
default-information originate always metric-type 1
timers throttle Isa 1 5 5000
timers throttle spf 1 5 5000
D. router ospf 1
no default-information originate
tiers throttle Isa all 1 5 5000
times throttle spf 1 5 5000
E. router bgp 65000
address-family ipv4
no bgp next-hop trigger enable
bgp additional-paths install
!
address-family vpnv4
no bgp next-hop trigger enable
bgp additional-paths install
Answer: A
Which description of the Russian Doll Model is true?
A. RDM provides bandwidth sharing while providing bandwidth isolation and protection against QoS degradation, and also provides service differentiation for high-priority, normal-priority and best-effort priority services
B. RDM matches simple bandwidth control policies setting individual bandwidth constraint for a given class type and simultaneously limit the aggregate of reserved bandwidth across all class types
C. RDM can be used simultaneously to ensure bandwidth efficiency and to protect against QoS degradation of all class types, whether preemption is used or not
D. RDM guarantees a predefined amount of bandwidth for each type and at the same time allows the bandwidth sharing by defining two pools for every class type: private pool (guaranteed bandwidth) and common pool (bandwidth shared between all class types)
Answer: C
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