01. How does an untrusted interface at the boundary of an administrative domain handle incoming packets?
a) It remarks all values to a CoS of 0.
b) It forwards only traffic with a DSCP value of 48.
c) It translates the IP precedence value to the corresponding DSCP value.
d) It drops all traffic ingressing the network.
02. Egress PE NAT is being used via a single centralized router to provide Internet access to L3VPN customers. Which description of the NAT operation is true?
a) Multiple address pools are needed for the same L3VPN because each site has a separate NAT.
b) The NAT table contains a field to identify the inside VRF of a translation.
c) The different L3VPNs using the Internet access must not have IP overlaps internally.
d) Users in different VRFs cannot share the same outside global IP address.
03. Which regular expression query modifier function indicates the start of a string?
a) +
b) [^]
c) ^
d) $
04. On the BGP Best Path Selection, when two external paths from different EBGP neighbors are received, the oldest path received can be the tie break to select the best path. Which Cisco IOS command ignores this decision criteria and checks the next decision criteria?
a) bgp best path as-path ignore
b) bgp best path med missing-as-worst
c) bgp best path cost-community ignore
d) bgp best path compare-routerid
05. FRR is configured on a network. What occurs when the headend router on the path is alerted to a link failure over IGP?
a) LSP attempts fast switching on the backup path until the primary path returns to the active state.
b) The headend router uses a presignaled LSP to bypass the failure point.
c) A new backup tunnel is established past the PLR to pass through the protected nodes.
d) Backup tunnel is established and intersects with the primary tunnel at the headend.
06. A company is expanding its existing office space to a new floor of the building, and the networking team is installing a new set of switches. The new switches are running IGMPv2, and the engineers configured them for VLAN10 only. The rest of the existing network includes numerous Layer 2 switches in multiple other VLANs, all running IGMPv3.
Which additional task must the team perform when deploying the new switches so that traffic is switched correctly through the entire network?
a) Configure the new switches to use IGMPv3 on all VLANs on the network.
b) Configure all switches on the network to support IGMPv2 and IGMPv3 on all VLANs on the network.
c) Configure the new switches to use IGMPv3 on VLAN10 only.
d) Configure all switches on the network to support IGMPv2 and IGMPv3 on VLAN10 only.
07. On Cisco IOS XR devices, which action improves failure reaction for Link OAM when Path Isolation with Ethernet Failure Detection is used?
a) Bring down the line protocol interface state when a problem is detected
b) Change the interface status to error-disable operating at Layer 1
c) Triggers port suspend when heartbeat is lost
d) Close the gap when UDLD detects that Ethernet ports are miswired
08. What causes multicast traffic to permanently stay on the shared tree and not switch to the source tree?
a) SSM range is being used
b) The RP announcements are being filtered
c) The RP IP address is configured incorrectly
d) The SPT threshold is set to infinity
09. An engineer must extend Layer 2 Between two campus sites connected through an MPLS backbone that encapsulates Layer 2 and Layer 3 data Which action must the engineer perform on the routers to accomplish this task?
a) Configure a pseudowire for E-LINE.
b) Configure a EtherChannel for E-LAN.
c) Configure QoS for MPLS and E-ACCESS
d) Configure Cisco MPLS TE for use with E-TREE.
10. The network team is planning to implement IPv6 on the company’s existing IPv4 infrastructure. IS-IS is already used as the IGP for IPv4. The team has decided to run IS-IS in multitopology mode for IPv6 so that IPv4 and IPv6 can use different logical topologies. Which configuration task must be performed on the routers?
a) Configure the network routers to use metric-style wide only for IPv4.
b) Under the IS-IS process, enable the IPv6 address family with multi-topology and apply it to dual-stack interfaces.
c) Configure all links as point-to-point to avoid DIS elections.
d) Configure all routers as Level-2-only to simplify the IS-IS design.
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