350-401 practice questions 821–830

1. Question 821 · 1003 in bank

   Refer to the exhibit.

   

   MTU has been configured on the underlying physical topology, and no MTU command has been configured on the tunnel interfaces. What happens when a 1500-byte IPv4 packet traverses the GRE tunnel from host X to host Y, assuming the DF bit is cleared?

   • AThe packet is discarded on router B
   • BThe packet arrives on router C without fragmentation
   • CThe packet arrives on router C fragmented
   • DThe packet is discarded on router A

   Show answer

   Answer: C

   Explanation

   GRE is 20 IP Header Bytes and 4 GRE Header Bytes and another 4 Bytes if a Tunnel key is used. 1500 + 28 > 1500 so the packet has to be fragmented to traverse the ethernet having a Maximum Transmission Unit of 1500 Bytes. If the DF bit was set, the packet would be discarded.

   Source: Adapted from community discussion — [Removed]

   References

   • cisco.com documentation
   • cisco.com documentation

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2. Question 822 · 1003 in bank

   What is one difference between the RIB and the FIB?

   • AThe RIB keeps all routing information received from peers, and the FIB keeps the minimum information necessary to make a forwarding decision.
   • BThe RIB works at the data plane, and the FIB works at the control plane.
   • CThe FIB contains routing prefixes, and the RIB contains the Layer 2 and Layer 3 information necessary to make a forwarding decision.
   • DThe RIB is known as the CEF table, and the FIB is known as the routing table.

   Show answer

   Answer: A

   Explanation

   Option A is correct. The RIB keeps all routing information received from peers, while the FIB keeps the minimum information necessary to make a forwarding decision. In more detail, the RIB, also known as the routing table, contains all the routes learned from various routing protocols, connected networks, static routes etc. It’s used by the router to make the best path decisions. On the other hand, the FIB, also known as the CEF (Cisco Express Forwarding) table in Cisco routers, contains a subset of the RIB routes that are used to make actual forwarding decisions in the data plane. It’s optimized for quick lookup, which is crucial for efficient packet forwarding.

   Source: Adapted from community discussion — cloud29

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3. Question 823 · 1003 in bank

   What is a characteristic of an AP operating in FlexConnect mode?

   • AAll traffic traverses the WLC to ensure policy enforcement on client traffic.
   • BForwarding for locally switched traffic continues when the AP loses connectivity to the WLC.
   • CAPs connect in a mesh topology and elect a root AP
   • DFlexConnect enables an AP to connect to multiple WLCs.

   Show answer

   Answer: B

   Explanation

   B. Forwarding for locally switched traffic continues when the AP loses connectivity to the WLC. In FlexConnect mode, the access point (AP) is capable of locally switching user traffic and forwarding it directly to the destination without the need to tunnel the traffic back to the wireless LAN controller (WLC). This allows for efficient utilization of network resources and helps to reduce latency. If the AP loses connectivity to the WLC, it can still forward locally switched traffic, providing continuity for user data forwarding even in case of a temporary disconnection from the controller.

   Source: Adapted from community discussion — teems5uk

   References

   • Cisco documentation

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4. Question 824 · 1003 in bank

   What is the benefit of using TCAM for IP forwarding decisions versus using the CAM table?

   • ATCAM finds results based on binary, and CAM uses the longest match to find results
   • BTCAM processes lookups in a hardware CPU. and CAM relies on binary masks to find results.
   • CTCAM finds results based on masks, and CAM finds results basing on exact match.
   • DTCAM uses low cost hardware memory to store addresses, and CAM uses expensive hardware memory.

   Show answer

   Answer: C

   Explanation

   The benefit of using TCAM (Ternary Content Addressable Memory) for IP forwarding decisions is that TCAM allows for matching based on masks. TCAM can perform ternary (three-state) matching, which means it can match on exact values as well as wildcard masks. This capability is particularly useful for routing lookups where variable-length prefixes (subnets) are involved. TCAM is efficient for performing lookups based on both exact matches and prefix matches, making it well-suited for forwarding decisions in routers where variable-length subnet masks are common. On the other hand, CAM (Content Addressable Memory), typically used in traditional MAC address tables, performs exact matching and doesn't support wildcard masks for variable-length matches like TCAM does.

   Source: Adapted from community discussion — teems5uk

   References

   • cisco.com documentation
   • cisco.com documentation
   • cisco.com documentation

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5. Question 825 · 1003 in bank

   

   Refer to the exhibit. Two indirectly connected routers fail to form an OSPF neighborship. What is the cause of the issue?

   • Afailing hello packets between the two routers
   • BDR/BDR selection dispute
   • CMTU mismatch
   • DOSPF network type mismatch

   Show answer

   Answer: C

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6. Question 826 · 1003 in bank

   Which feature is provided by Cisco Mobility Services Engine in a Cisco Wireless Unified Network architecture?

   • AIt adds client packet capturing.
   • BIt enables NetFlow data collection.
   • CIt adds client tracking and location API.
   • DIt identifies authentication problems.

   Show answer

   Answer: C

   Explanation

   C. It adds client tracking and location API. Cisco Mobility Services Engine (MSE) in a Cisco Wireless Unified Network architecture provides features related to location-based services. It adds client tracking and offers a location API (Application Programming Interface) that allows applications to access information about the location of wireless clients within the network. This capability enables the development of location-aware applications and services. MSE can provide information about the real-time location of wireless clients, facilitating applications such as asset tracking, location-based services, and more.

   Source: Adapted from community discussion — teems5uk

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7. Question 827 · 1003 in bank

   Which unit of measure is used to measure wireless RF SNR?

   • AdBi
   • BdB
   • CdBm
   • DmW

   Show answer

   Answer: B

   Explanation

   A. dBi (decibels isotropic) - Used to measure the gain of an antenna compared to an isotropic radiator. B. dB (decibels) - Used to measure the signal-to-noise ratio (SNR) in wireless RF communication. C. dBm (decibel-milliwatts) - Used to measure the absolute power level of a signal relative to 1 milliwatt. D. mW (milliwatts) - Used to measure absolute power level directly, without using a logarithmic scale like dB or dBm.

   Source: Adapted from community discussion — slacker_at_work

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8. Question 828 · 1003 in bank

   DRAG DROP - Drag and drop the components of the Cisco SD-Access fabric architecture from the left onto the correct descriptions on the right. Not all options are used.

   

   This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.

   Show the answer figure

   Answer: See figure below

   References

   • Cisco documentation

   

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9. Question 829 · 1003 in bank

   Select 2

   In a campus network design, what are two benefits of using BFD for failure detection? (Choose two.)

   • ABFD speeds up routing convergence time.
   • BBFD is an efficient way to reduce memory and CPU usage.
   • CBFD provides fault tolerance by enabling multiple routers to appear as a single virtual router.
   • DBFD provides path failure detection in less than a second.
   • EBFD enables network peers to continue forwarding packets in the event of a restart.

   Show answer

   Answer: AD

   Explanation

   BFD speeds up routing convergence time (Option A). BFD can detect a path failure and notify the routing protocols in a matter of milliseconds to seconds, depending on the configuration. This allows for faster rerouting of traffic, speeding up the routing convergence time. BFD provides path failure detection in less than a second (Option D). BFD is designed to provide fast failure detection times for all media types, encapsulations, topologies, and routing protocols. In addition to being protocol independent, BFD also provides a consistent failure detection method for network administrators.

   Source: Adapted from community discussion — cloud29

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10. Question 830 · 1003 in bank

    

    Refer to the exhibit. A network engineer issues the debug command while troubleshooting a network issue. What does the output confirm?

    • AACL 100 is tracking ICMP traffic from 10.1.1.1 destined for 1.1.1.1.
    • BACL100 is tracking all traffic from 10.1.1.1 destined for 1.1.1.1.
    • CACL100 is tracking ICMP traffic from Serial1/0 destined for Serial3/0.
    • DACL100 is tracking ICMP traffic from 1.1.1.1 destined for 10.1.1.1.

    Show answer

    Answer: D

    Explanation

    A. ACL 100 is tracking ICMP traffic from 10.1.1.1 destined for 1.1.1.1. -- source is 1.1.1.1 --wrong B. ACL100 is tracking all traffic from 10.1.1.1 destined for 1.1.1.1.-- source is 1.1.1.1 --wrong C. ACL100 is tracking ICMP traffic from Serial1/0 destined for Serial3/0. -- tracks ips that just happen to be in these interfaces, ACL is configured with ips --wrong D. ACL100 is tracking ICMP traffic from 1.1.1.1 destined for 10.1.1.1. -- seems to be correct

    Source: Adapted from community discussion — kaupz

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350-401 practice, question 821. 1003 questions available.