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質問 # 36
Refer to the exhibit.
A technician pastes the configurations in the exhibit into the two new routers shown. Otherwise, the routers are configured with their default configurations. A ping from Host1 to Host2 fails, but the technician is able to ping the S0/0 interface of R2 from Host1. The configurations of the hosts have been verified as correct. What is the cause of the problem?
- A. R1 has no route to the 192.168.1.128 network.
- B. The ip subnet-zero command must be configured on both routers.
- C. The interfaces on R2 are not configured properly.
- D. The IP addressing scheme has overlapping subnetworks.
- E. The serial cable on R1 needs to be replaced.
正解：A
質問 # 37
A large news company wants to develop a test that will show up in their marketing-mix model. The goal is to identify the effect of a new media channel during a one-week test conducted across many digital channels as well as TV. They are a national newspaper, so a significant number of conversions come organically on a weekly basis.
The company typically spends $275,000 per week on media, and plans to spend an additional $5,000 on this test, for a total weekly spend of $280,000. The company typically spreads the $275,000 across three digital channels and a mid-sized TV buy.
Which action should be taken to ensure the feasibility of the test showing up in the model?
- A. Increase the duration of the test-period
- B. Increase the number of channels being used
- C. Increase the overall advertising spend across the target channel
- D. Remove TV spending from the campaign
正解：C
質問 # 38
Which command is used to display the collection of OSPF link states?
- A. show ip ospf lsa database
- B. show ip ospf neighbors
- C. show ip ospf database
- D. show ip ospf link-state
正解：C
解説：
http://www.cisco.com/en/US/docs/ios/iproute_ospf/command/reference/iro_osp3.html#wp101217
Examples The following is sample output from the show ip ospf database command when no arguments or keywords are used: Router# show ip ospf database OSPF Router with id(192.168.239.66) (Process ID 300)
質問 # 39
Refer to the exhibit.
When running EIGRP, what is required for RouterA to exchange routing updates with RouterC?
- A. The no auto-summary command is needed on Router A and Router C
- B. Loopback interfaces must be configured so a DR is elected
- C. Router B needs to have two network statements, one for each connected network
- D. AS numbers must be changed to match on all the routers
正解：D
質問 # 40
A taxi company is working on building an understanding of household customer lifetime value. Some of their customers order via digital platforms, some via phone, and some alternate between the two. They currently calculate lifetime value (LTV) by looking at all hashed order data including email addresses for online customers and all phone numbers for phone orders. The results showed that email customers had a yearly LTV of $100, and the phone customers had a yearly LTV of $80. However, the company is aware that a group of people are introducing some noise into the results by ordering via both phone and online.
What solution should the analyst recommend to enhance the ability to create a functional LTV model?
- A. Remove all customers who use both from the LTV model
- B. Gather hashed email and phone number for each order on any channel
- C. Ask online customers to provide their phone number in a post-order survey
- D. Select the average of the two models
正解：A
質問 # 41
An advertiser is running an A/B test on Facebook with the goal of finding whether creative strategy A or B achieves the most conversions. What is the null hypothesis of this test design?
- A. Conversions (A) <> 0, Conversions (B) <> 0
- B. Conversions (A) <> Conversions (B)
- C. Conversions (A) = Conversions (B)
- D. Conversions (A) = 0, Conversions (B) = 0
正解：D
質問 # 42
What is the purpose of Inverse ARP?
- A. to map a known DLCI to an IP address
- B. to map a known IP address to a MAC address
- C. to map a known MAC address to an IP address
- D. to map a known SPID to a MAC address
- E. to map a known IP address to a SPID
- F. to map a known DLCI to a MAC address
正解：A
質問 # 43
Which two options are valid WAN connectivity methods? (Choose two.)
- A. PPP
- B. Ethernet
- C. WAP
- D. DSL
- E. L2TPv3
正解：A、D
質問 # 44
Refer to the exhibit.
Which WAN protocol is being used?
- A. Frame Relay
- B. ATM
- C. HDLC
- D. PPP
正解：A
解説：
"Show interface pos8/0/0" command showing LMI enq sent which show frame-relay encapsulation enabled on this interface.Cisco supports three different Local Management Interface (LMI) types for Frame Relay: Cisco, ANSI Annex D, and Q933-A Annex A http://www.ciscopress.com/articles/article.asp?p=170741&seqNum=3
質問 # 45
A router is running three routing processes: RIP, OSPF, and EIGRP, each configured with default characteristics. Each process learns a route to the same remote network. If there are no static routes to the destination and none of the routes were redistributed, which route will be placed in the IP routing table?
- A. the route learned through OSPF
- B. the route with the lowest metric
- C. all three routes with the router load balancing
- D. the route learned through EIGRP
- E. the route learned through RIP
正解：D
質問 # 46
Which statements are true about EIGRP successor routes? (Choose two.)
- A. Successor routes are flagged as 'active' in the routing table.
- B. Successor routes are stored in the neighbor table following the discovery process.
- C. A successor route may be backed up by a feasible successor route.
- D. A successor route is used by EIGRP to forward traffic to a destination.
- E. Successor routes are saved in the topology table to be used if the primary route fails.
正解：C、D
解説：
Introduction to EIGRP http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml
Feasible Successors A destination entry is moved from the topology table to the routing table when there is a feasible successor. All minimum cost paths to the destination form a set. From this set, the neighbors that have an advertised metric less than the current routing table metric are considered feasible successors. Feasible successors are viewed by a router as neighbors that are downstream with respect to the destination.
These neighbors and the associated metrics are placed in the forwarding table.
When a neighbor changes the metric it has been advertising or a topology change occurs in the
network, the set of feasible successors may have to be re-evaluated. However, this is not
categorized as a route recomputation.
質問 # 47
Refer to the exhibit.
Which WAN protocol is being used?
- A. Frame Relay
- B. ATM
- C. HDLC
- D. PPP
正解：A
質問 # 48
A beverage brand plans to launch a World Cup campaign to generate awareness across digital, TV and print. It recently ran a marketing mix model to determine the performance of this campaign. The analysis proved that the campaign resulted in a lift in sales. Due to the high cost of World Cup ads, the ROI was $0.15, which is below their historical norms for campaigns.
How should the analysis help contextualize the results?
- A. Advertised across too many channels
- B. Awareness campaigns are not designed to drive conversions
- C. Based on viewership of the World Cup, CPMs are particularly high
- D. The campaign was contaminated by TV advertising
正解：A
質問 # 49
Refer to the exhibit.
The output that is shown is generated at a switch. Which three statements are true? (Choose three.)
- A. The bridge priority is lower than the default value for spanning tree.
- B. Thirty VLANs have been configured on this switch.
- C. All designated ports are in a forwarding state.
- D. All ports will be in a state of discarding, learning, or forwarding.
- E. This switch must be the root bridge for all VLANs on this switch.
- F. All interfaces that are shown are on shared media.
正解：A、C、D
解説：
From the output, we see that all ports are in Designated role (forwarding state) -> A and E are
correct.
The command "show spanning-tree vlan 30 only shows us information about VLAN 30. We don't
know how many VLAN exists in this switch -> B is not correct.
The bridge priority of this switch is 24606 which is lower than the default value bridge priority
32768 -> C is correct.
All three interfaces on this switch have the connection type "p2p", which means Point-to-point
environment - not a shared media -> D is not correct.
The only thing we can specify is this switch is the root bridge for VLAN 3o but we can not
guarantee it is also the root bridge for other VLANs -> F is not correct.
質問 # 50
Refer to the exhibit.
A network associate has configured OSPF with the command:
City(config-router)# network 192.168.12.64 0.0.0.63 area 0
After completing the configuration, the associate discovers that not all the interfaces are participating in OSPF. Which three of the interfaces shown in the exhibit will participate in OSPF according to this configuration statement? (Choose three.)
- A. Serial0/0
- B. FastEthernet0 /0
- C. Serial0/1.104
- D. Serial0/1.103
- E. Serial0/1.102
- F. FastEthernet0 /1
正解：A、E、F
質問 # 51
What are three characteristics of the OSPF routing protocol? (Choose three.)
- A. It uses cost to determine the best route.
- B. OSPF routers discover neighbors before exchanging routing information.
- C. OSPF is a classful routing protocol.
- D. It converges quickly.
- E. It uses the DUAL algorithm to determine the best route.
- F. OSPF routers send the complete routing table to all directly attached routers.
正解：A、B、D
解説：
Open Shortest Path First Reference:
http://docwiki.cisco.com/wiki/Open_Shortest_Path_First
Explanation:
Additional OSPF features include equal-cost, multipath routing, and routing based on upper-layer type-ofservice
(TOS) requests. TOS-based routing supports those upper-layer protocols that can specify particular
types of service. An application, for example, might specify that certain data is urgent. If OSPF has high-priority
links at its disposal, these can be used to transport the urgent datagram.
OSPF supports one or more metrics. If only one metric is used, it is considered to be arbitrary, and TOS is not supported. If more than one metric is used, TOS is optionally supported through the use of a separate metric (and, therefore, a separate routing table) for each of the eight combinations created by the three IP TOS bits (the delay, throughput, and reliability bits). For example, if the IP TOS bits specify low delay, low throughput, and high reliability, OSPF calculates routes to all destinations based on this TOS designation. IP subnet masks are included with each advertised destination, enabling variable-length subnet masks. With variable-length subnet masks, an IP network can be broken into many subnets of various sizes. This provides network administrators with extra network-configuration flexibility.
質問 # 52
Which three statements about RSTP are true? (Choose three.)
- A. RSTP uses the same timer-based process as STP on point-to-point links.
- B. RSTP port states are blocking, discarding, learning, or forwarding.
- C. RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
- D. RSTP expands the STP port roles by adding the alternate and backup roles.
- E. RSTP also uses the STP proposal-agreement sequence.
- F. RSTP significantly reduces topology reconverging time after a link failure.
正解：C、D、F
解説：
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml
Convergence Cisco enhanced the original 802.1D specification with features such as Uplink Fast, Backbone Fast, and Port Fast to speed up the convergence time of a bridged network. The drawback is that these mechanisms are proprietary and need additional configuration.
Alternate and Backup Port Roles These two port roles correspond to the blocking state of 802.1D. A blocked port is defined as not being the designated or root port. A blocked port receives a more useful BPDU than the one it sends out on its segment.
Remember that a port absolutely needs to receive BPDUs in order to stay blocked. RSTP introduces these two roles for this purpose. Rapid Transition to Forwarding State Rapid transition is the most important feature introduced by 802.1w. The legacy STA passively waited for the network to converge before it turned a port into the forwarding state. The achievement of faster convergence was a matter of tuning the conservative default parameters (forward delay and max_age timers) and often put the stability of the network at stake. The new rapid STP is able to actively confirm that a port can safely transition to the forwarding state without having to rely on any timer configuration. There is now a real feedback mechanism that takes place between RSTP-compliant bridges. In order to achieve fast convergence on a port, the protocol relies upon two new variables: edge ports and link type.
質問 # 53
What are three reasons that an organization with multiple branch offices and roaming users might implement a Cisco VPN solution instead of point-to-point WAN links? (Choose three.)
- A. scalability
- B. broadband incompatibility
- C. reduced cost
- D. better throughput
- E. increased security
- F. reduced latency
正解：A、C、E
解説：
Enhance Productivity and Cut Costs Cisco VPN solutions provide exceptional security through encryption and authentication technologies that protect data in transit from unauthorized access and attacks. A Cisco VPN helps you: Use highly secure communications, with access rights tailored to individual users Quickly add new sites or users, without significantly expanding your existing infrastructure Improve productivity by extending corporate networks, applications, and collaboration tools Reduce communications costs while increasing flexibility
質問 # 54
A start-up ecommerce brand that sells pet products wants to test campaign structure. It would like to determine if it should have separate ad sets targeting different pet interest groups or consolidate all interest groups into one ad set.
The brand sets up a multi-cell Conversion Lift test for one month. At the end of the test, no results are available to review, due to insufficient statistical power.
Which two approaches should the analyst recommend? (Choose 2)
- A. Run a multi-cell Conversion Lift test with an increased holdout percentage
- B. Run a multi-cell Conversion Lift with fewer interest groups
- C. Review campaign results in Ads Manager instead
- D. Run a campaign-level A/B test instead
正解：A、D
質問 # 55
Refer to the exhibit.
What address is a feasible successor?
- A. 10.1.2.2
- B. 10.1.4.4
- C. 172.16.4.0
- D. 172.16.3.0
正解：A
質問 # 56
Which two states are the port states when RSTP has converged? (Choose two.)
- A. disabled
- B. listening
- C. forwarding
- D. discarding
- E. learning
正解：C、D
解説：
Understanding Rapid Spanning Tree Protocol (802.1w)
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml
Port States There are only three port states left in RSTP that correspond to the three possible operational states. The 802.1D disabled, blocking, and listening states are merged into a unique 802.1w discarding state. RSTP only has 3 port states which are discarding, learning and forwarding. When RSTP has converged there are only 2 port states left: discarding and forwarding.
質問 # 57
Which two are advantages of static routing when compared to dynamic routing? (Choose two.)
- A. Routing updates are automatically sent to neighbors.
- B. Configuration complexity decreases as network size increases.
- C. An efficient algorithm is used to build routing tables, using automatic updates.
- D. Routing traffic load is reduced when used in stub network links.
- E. Routing tables adapt automatically to topology changes.
- F. Route summarization is computed automatically by the router.
- G. Security increases because only the network administrator may change the routing table.
正解：D、G
質問 # 58
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