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单选题
An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）
A
EXP bits
B
VPI / VCI
C
shim header
D
SNAP header
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In a Bridged 1483 network, what Layer 2 encapsulations are passed between the DSL bridge and the ERX?()
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A user is connected on a DSL line and is using a PPP over Ethernet service.Which network device strips the ATM header from the datagram and investigates the PPP header?()
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Which configuration command allows the ERX Edge Router to perform Unicast Reverse Path Forwarding lookups on all packets received on an IP interface?（）A、ip sa-validateB、ip split-horizonC、ip access-routesD、ip filter-options
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What is the default Quality of Service traffic class used by the ERX Edge Router?（）A、bronze forwardingB、assured forwardingC、expedited forwardingD、best effort forwarding
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A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?（）A、It performs a label pop operation and an IP lookup.B、It performs a label swap operation and an IP lookup.C、It sends an error message toward the egress router.D、It sends an error message toward the ingress router.
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What is used as label in cell-based MPLS ？（）A、VPIB、VCIC、VPI and VCID、Specific 4 bytes labelE、None of above
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Which statement correctly describes the disabling of IP TTL propagation in an MPLS network？（）A、The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSRB、TTL propagation cannot be disabled in an MPLS domainC、TTL propagation is only disabled on the ingress edge LSRD、The TTL field of the MPLS label header is set to 255E、The TTL field of the IP packet is set to 0
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An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）A、EXP bitsB、VPI / VCIC、shim headerD、SNAP header
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A user is connected on a DSL line and is using a PPP over Ethernet service. Which network device encapsulates the datagram inside of an ATM header?（）A、DSLAMB、DSL modemC、ERX Edge RouterD、customer workstation
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A user is connected on a DSL line and is using a PPP over Ethernet service.Which network device strips the ATM header from the datagram and investigates the PPP header?（）A、DSLAMB、DSL modemC、ERX Edge RouterD、customer workstation
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单选题Which statement correctly describes the disabling of IP TTL propagation in an MPLS network？（）A
The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSRB
TTL propagation cannot be disabled in an MPLS domainC
TTL propagation is only disabled on the ingress edge LSRD
The TTL field of the MPLS label header is set to 255E
The TTL field of the IP packet is set to 0
考题
单选题End users are failing to log in to the network. Which command is used on the ERX Edge Router to validate communications with the RADIUS server?（）A
test ppp aaaB
test aaa pppC
test radius userD
test user radius
考题
单选题What is the default Quality of Service traffic class used by the ERX Edge Router?（）A
bronze forwardingB
assured forwardingC
expedited forwardingD
best effort forwarding
考题
单选题Which configuration command allows the ERX Edge Router to perform Unicast Reverse Path Forwarding lookups on all packets received on an IP interface?（）A
ip sa-validateB
ip split-horizonC
ip access-routesD
ip filter-options
考题
单选题A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?（）A
It performs a label pop operation and an IP lookup.B
It performs a label swap operation and an IP lookup.C
It sends an error message toward the egress router.D
It sends an error message toward the ingress router.
考题
单选题An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）A
EXP bitsB
VPI / VCIC
shim headerD
SNAP header
考题
单选题Which configuration command is used to make the ERX Edge Router an NTP server？（）A
set ntp-serverB
set ntp serverC
ntp-server enableD
ntp server enable
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