200-301 practice questions 421–430

1. Question 421 · 1334 in bank

   What is a benefit for external users who consume public cloud resources?

   • AImplemented over a dedicated WAN
   • BAll hosted on physical servers
   • CAccessed over the Internet
   • DLocated in the same data center as the users

   Show answer

   Answer: C

   Explanation

   C. Accessed over the Internet Explanation: The benefit for external users who consume public cloud resources is that these resources can be accessed over the Internet. Public cloud services are hosted by third-party providers on a global scale and are made available to users over the Internet. This provides flexibility and accessibility for users from different locations to access and use the cloud resources without the need for a dedicated WAN or being in the same data center as the resources. Options A and D are not accurate for describing public cloud resources: A. Public cloud resources are typically accessed over the public Internet, not necessarily over a dedicated WAN. D. Public cloud resources are distributed across multiple data centers, and users can access them from anywhere with an Internet connection, not necessarily from the same data center.

   Source: Adapted from community discussion — Cyber15

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2. Question 422 · 1334 in bank

   An engineer must update the configuration on two PCs in two different subnets to communicate locally with each other. One PC is configured with IP address 192.168.25.128/25 and the other with 192.168.25.100/25. Which network mask must the engineer configure on both PCs to enable the communication?

   • A255.255.255.248
   • B255.255.255.224
   • C255.255.255.0
   • D255.255.255.252

   Show answer

   Answer: C

   Explanation

   Just to add more info here: A, .248 has a group size of 8. At a glance that's too small to include both .100 and .128. .252 has a group size of 4. Same as above. .224 seems large enough with a 32 group size, but if you subnet you'll find that .128 is a network address. That leaves us with 255.255.255.0. Which gives us the first usable at .25.1 and the last usable at .25.254.

   Source: Adapted from community discussion — Customexit

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3. Question 423 · 1334 in bank

   Which key function is provided by the data plane?

   • AOriginating packets
   • BExchanging routing table data
   • CMaking routing decisions
   • DForwarding traffic to the next hop

   Show answer

   Answer: D

   Explanation

   Explanation: The data plane, also known as the forwarding plane, is responsible for the actual forwarding of data packets within a network. The key function of the data plane is to forward packets from the source to the destination based on the information in the forwarding table or forwarding information base (FIB). This involves making decisions on how to move the data through the network and ultimately forwarding it to the next hop in the network path. Options A, B, and C are typically associated with the control plane: A. Originating packets: This is a function of the control plane, where devices create or generate packets. B. Exchanging routing table data: This is also a function of the control plane, where devices share routing information to build and update their routing tables. C. Making routing decisions: This is a control plane function where decisions are made on how to route traffic based on the information gathered through routing protocols.

   Source: Adapted from community discussion — Cyber15

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4. Question 424 · 1334 in bank

   When should an engineer implement a collapsed-core architecture?

   • AOnly when using VSS technology
   • BFor small networks with minimal need for growth
   • CFor large networks that are connected to multiple remote sites
   • DThe access and distribution layers must be on the same device

   Show answer

   Answer: B

   Explanation

   B is the Answer. A collapsed core architecture is typically implemented in small networks, wheres as a three tier architecture is deployed into larger networks where scalabily will be a factor

   Source: Adapted from community discussion — learnNcurve

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5. Question 425 · 1334 in bank

   

   Refer to the exhibit. An engineer assigns IP addressing to the current VLAN with three PCs. The configuration must also account for the expansion of 30 additional VLANS using the same Class C subnet for subnetting and host count. Which command set fulfills the request while reserving address space for the expected growth?

   • ASwitch(config)#interface vlan 10 Switch(config-if)#ip address 192.168.0.1 265 255.255.252
   • BSwitch(config)#interface vlan 10 Switch(config-if)#ip address 192.168.0.1 255 255.255.248
   • CSwitch(config)#interface vlan 10 Switch(config-if)#ip address 192.168.0.1 255 255.255.0
   • DSwitch(config)#interface vlan 10 Switch(config-if)#ip address 192.168.0.1 255.255.255.128

   Show answer

   Answer: B

   Explanation

   I think that the answer is good. we are looking at 31 VLANs ( a sin 31 Subnets) and each one will have 3 hosts. So /29 will give us 32 subnets each with 8 hosts (6 usable). /29 means 248 mask, so B is correct.

   Source: Adapted from community discussion — vladals

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6. Question 426 · 1334 in bank

   A client experiences slow throughput from a server that is directly connected to the core switch in a data center. A network engineer finds minimal latency on connections to the server, but data transfers are unreliable, and the output of the show interfaces counters errors command shows a high FCS-Err count on the interface that is connected to the server. What is the cause of the throughput issue?

   • Aa physical cable fault
   • Ba speed mismatch
   • Chigh bandwidth usage
   • Da cable that is too long

   Show answer

   Answer: A

   Explanation

   The cause of the throughput issue described in the scenario is a physical cable fault. The scenario mentions that the network engineer found minimal latency on connections to the server, but data transfers are unreliable, and the output of the "show interfaces counters errors" command shows a high FCS-Err count on the interface that is connected to the server. FCS-Err (Frame Check Sequence error) indicates that there is a physical issue with the cable, such as noise or interference, that is causing the data transfer errors. A speed mismatch or high bandwidth usage may cause slow throughput or delays, but it would not cause FCS-Err errors. Similarly, a cable that is too long may cause signal attenuation, but it would not cause FCS-Err errors. Therefore, the answer to the question "What is the cause of the throughput issue?" is A. a physical cable fault.

   Source: Adapted from community discussion — dearc

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7. Question 427 · 1334 in bank

   What is the difference between 1000BASE-LX/LH and 1000BASE-ZX interfaces?

   • A1000BASE-LX/LH interoperates with multimode and single-mode fiber, and 1000BASE-ZX needs a conditioning patch cable with multimode.
   • B1000BASE-ZX interoperates with dual-rate 100M/1G 10Km SFP over multimode fiber, and 1000BASE-LX/LH supports only single-rate
   • C1000BASE-ZX is supported on links up to 1000km, and 1000BASE-LX/LH operates over links up to 70 km
   • D1000BASE- LX/LH is supported on links up to 10km, and 1000Base-ZX operates over links up to 70 km

   Show answer

   Answer: D

   Explanation

   Wow, some conflicting info out there. This is from Cisco site. D is correct. 1000BaseSX multi-mode fiber to 550 m. 1000BaseLX/LH multi-mode fiber to 550 m. Single-mode fiber to 10 km. 1000BaseZX single mode fiber to 70 km. https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/gigabit-ethernet-gbic-sfp-modules/datasheet-c78-366584.html?dtid=osscdc000283

   Source: Adapted from community discussion — in2it

   References

   • Cisco documentation

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8. Question 428 · 1334 in bank

   Select 2

   What are two reasons to implement IPv4 private addressing on a network? (Choose two.)

   • ATo enable internal applications to treat the private IPv4 addresses as unique
   • BTo facilitate renumbering when merging networks
   • CTo expand the routing table on the router
   • DTo provide protection from external denial-of-service attacks
   • ETo conserve global unique IPv4 addresses

   Show answer

   Answer: AE

   Explanation

   Private IPv4 addresses weren't created to be a form of protection. It's primary purpose was to enable internal networks to communicate while conserving public IPv4 addresses. A fits this narrative as multiple businesses could share the same private IP addresses and their application would still be able to communicate without interfering with other businesses thus it's unique to their internal applications. E for obvious reasons. D doesn't work because if you have servers that need to be reached from the outside you would have it port forwarded and thus having it exposed to the internet and DoS. Even if you don't have internal services advertised to the internet, attackers can still DoS your gateway because it has a public IP address.

   Source: Adapted from community discussion — RougePotatoe

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9. Question 429 · 1334 in bank

   Which IPv6 address type provides communication between subnets and cannot route on the Internet?

   • Alink-local
   • Bunique local
   • Cmulticast
   • Dglobal unicast

   Show answer

   Answer: B

   Explanation

   An IPv6 address type that provides communication between subnets and cannot route on the Internet is a link-local address. Link-local addresses are used for communication within a single network segment or link, such as between devices on a local area network (LAN). They are not intended to be routable over the Internet and are not assigned to devices that need to communicate with devices on other networks. Link-local addresses are identified by the prefix "FE80::/10" and are automatically generated by the device when it is connected to a network. They are usually used in conjunction with other types of IPv6 addresses, such as global unicast addresses, which are used for communication over the Internet. It's important to note that link-local addresses are not the same as loopback addresses, which are used for communication between a device and itself and are identified by the prefix "::1/128". Loopback addresses are not used for communication with other devices.

   Source: Adapted from community discussion — Alizadeh

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10. Question 430 · 1334 in bank

    Which concern is addressed with the use of private IPv4 addressing?

    • ALack of routing protocol support for CIDR and VLSM
    • BLack of security protocols at the network perimeter
    • CLack of available TCP/UDP ports per IPv5 address
    • DLack of available publicly routable unique IPv4 address

    Show answer

    Answer: D

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200-301 practice, question 421. 1334 questions available.