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单项选择题 Refer to the exhibit. R2 and R3 are routers connected using Ethernet services from a service provider and can receive pings from each other. OSPF is configured as the routing protocol but adjacency is not happening. According to the output of the show commands in the exhibit， what could be the most likely cause of the problem？（）

A. Ethernet interfaces were configured as point-to-point.
B. Process IDs are not matching.
C. Configured bandwidths do not match on both interfaces.
D. Broadcasts and multicast are not being propagated over the Ethernet services.
E. OSPF cost does not match on both interfaces.

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1.多项选择题Which two are natively included by the IEEE 802.1w standard？（）

A.instances can control a selection of VLANs
B.load balancing
C.fast transition to forwarding state
D.backbone，uplink，and portfast （or equivalent）
E.root，loop，and BPDU guard （or equivalent）

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2.多项选择题Which two attributes need to match for two switches to become members of the same MST region？（）

A.the table of 4096 elements that map the respective VLAN to STP instance number
B.VTP version
C.configuration revision number
D.native VLAN ID

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3.单项选择题Multicast is being deployed in the network， and only ip pim sparse-dense mode has been configured on allinterfaces in the network to support a new video streaming application. No other multicast configuration wasapplied anywhere in the network. Since enabling multicast， the network monitoring tools show periodic spikes in link utilization throughout the network， even in areas where the video application is not being used.What could be a possible cause？（）

A.PIM sparse mode is being used.
B.PIM dense mode is being used.
C.The BGP multicast address family has not been configured.
D.IGMP version 3 is being used.
E.IP PIM neighbor filters have not been applied.

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4.单项选择题Which configuration would make an IP SLA probe use a precedence value of 5？（）

A.ip sla 1 icmp-echo 1.1.1.1 tos 160
B.ip sla 1 icmp-echo 1.1.1.1 tos 20
C.ip sla 1 icmp-echo 1.1.1.1 precedence 5
D.ip sla 1 icmp-echo 1.1.1.1 dscp 20

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5.单项选择题You are the network administrator of an enterprise company that just deployed a global IP telephonyenvironment. In order to guarantee good voice quality，you asked your provider to implement QoS on the CE routers of your MPLS network. On your LAN，you have also deployed QoS.Users，however，keep complaining about bad voice quality，and the provider does not see matches on the DSCP values that you have asked him to match upon. What is most likely the problem？（）

A.The phones are not sending traffic with the correct DSCP value.
B.The Cisco CallManager is not marking the traffic correctly.
C.This is most likely a bug on the CE routers.
D.Your LAN QoS is incorrectly configured.

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6.单项选择题You are the network administrator of a Layer 3 switched network. Users in one VLAN are complaining thataccess to the server VLAN is very slow from time to time. Traffic in the local VLAN works without any issue，and users in other VLANs do not have any complaint to reach the server VLAN. What is most likely thecause of this issue？（）

A.routing issue
B.denial-of-service attack
C.MAC flooding
D.spanning-tree recalculation
E.Layer 2 loop
F.ARP spoofing attack

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7.单项选择题You are deploying two core switches， one in each building， 50 km away from each other. The cross-connection between them will be a Layer 2 2-gigabit EtherChannel with an 802.1Q trunk. You configured it correctly but the link does not come up. The port is in the "admin up" state， and the line protocol is in the "down" state. The fiber link is OK. What would be the most likely reason for the link not to come up？（）

A. The switches are not the same model
B. You are not using the correct SFP
C. You are not using correct optical media converters
D. Configuration should be modified， because the distance is longer

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8.多项选择题Your company is researching a new application that runs over IPv6， but part of it must still have IPv4 support. Your company uses a traditional IPv4 network. Your plan is not to run IPv6 over the whole network， but to segment parts of the network or even to operate simultaneously with IPv6 and IPv4. You must make a brief presentation about IPv6 technology to the board of technical directors. Which three of these items could be part of your presentation？（）

A. Tunnel IPv6 over IPv4 to connect far-end IPv6 networks
B. Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is not possible
C. Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is possible
D. What is the meaning of EUI-64 and how does it work？
E. Tunnel IPv4 over IPv6 to connect far-end IPv4 networks.

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9.单项选择题What is a characteristic of Network Time Protocol？（）

A.NTP updates are sent in the timezone they are collected in，and the syslog server will adjust based on the input time.
B.NTP authentication verifies the source，not the recipient.
C.NTP authentication requires that the recipient has multiple strata clocks to ensure accuracy.
D.Secure NTP can be configured to use SHA-1 hashing，since NTP is very insecure.
E.A stratum 0 clock should be configured at the core of every network，so it can connect to an accuratetime source.

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10.单项选择题 Refer to the exhibit. You are setting up a 2-gigabit EtherChannel. Following IEEE standards， the exhibit shows your configuration in a local switch1. However， EtherChannel is not coming up. Which one of these statements could be a possible reason？（）

A. EtherChannel is only available in Cisco equipment.
B. The customer side is supposed to be running PAgP, which is a Cisco standard.
C. PAgP is not an IEEE standard. VRRP should be used.
D. The configuration on switch1 needs to be modified to use LACP.

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