Cisco CCNA 200-301 Questions & Answers

• Question 1081:

  DRAG DROP

  Drag and drop the Cisco Wireless LAN Controller security settings from the left onto the correct security mechanism categories on the right.

  Select and Place:

  

  Correct Answer:

  

  Layer 2 Security Mechanism includes WPA+WPA2, 802.1X, Static WEP, CKIP while Layer 3 Security Mechanisms (for WLAN) includes IPSec, VPN Pass-Through, Web Passthrough … Reference: https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/106082-wlc-compatibility-matrix.html

• Question 1082:

  Using direct sequence spread spectrum, which three 2.4-GHz channels are used to limit collisions?

  A. 1,6.11

  B. 1,5,10

  C. 1,2,3

  D. 5,6,7

  Correct Answer: A

  In the 2.4 GHz frequency band, the three channels that are commonly used to limit collisions when using direct sequence spread spectrum (DSSS) are channels 1, 6, and 11. These channels are spaced far enough apart in the spectrum to minimize the likelihood of interference between devices operating on different channels.

  DSSS is a spread spectrum technique that is used to reduce the impact of interference on wireless communication. It involves spreading the data signal over a wide frequency band by modulating the data with a high-frequency code, or "chipping" code. This chipping code is used to spread the signal over a wide frequency range, making it less vulnerable to interference and more resistant to noise.

  By using DSSS and selecting channels 1, 6, and 11, it is possible to limit collisions and improve the performance of the wireless network. It's important to note, however, that other factors, such as the number of devices on the network, the type of devices, and the distance between devices, can also impact the performance of the network and may require additional strategies to optimize network performance.

• Question 1083:

  A device detects two stations transmitting frames at the same time. This condition occurs after the first 64 bytes of the frame is received interface counter increments?

  A. collision

  B. CRC

  C. runt

  D. late collision

  Correct Answer: D

  If a device detects two stations transmitting frames at the same time after the first 64 bytes of the frame is received, this is an indication of a collision on the network. When a collision occurs, the device's interface counter for collisions will increment.

  The collision counter is a metric that is used to track the number of collisions that occur on a network interface. It is one of several counters that can be used to monitor the performance of a network interface and identify potential problems. Other counters that may be used to monitor the performance of a network interface include counters for transmitted and received frames, errors, and discards.

  If the collision counter is consistently high, it may indicate that there is a problem with the network, such as a high level of contention for network resources or a configuration issue. In this case, it may be necessary to troubleshoot the issue and take steps to reduce the number of collisions on the network. This could involve optimizing network configuration, adding additional network resources, or implementing other strategies to improve network performance.

• Question 1084:

  Which technology is used to improve web traffic performance by proxy caching?

  A. WSA

  B. Firepower

  C. ASA

  D. FireSIGHT

  Correct Answer: A

  https://www.cisco.com/c/en/us/products/collateral/security/web-security-appliance/guide-c07-742373.html

  4.1 Web proxy Caching should be enabled in the web proxy configuration in order to save bandwidth and boost performance. This is becoming less important as the percentage of HTTPS traffic increases because the WSA does not by default cache HTTPS transactions. If the proxy is deployed to serve only explicit clients, forward mode should be specified in order to reject any traffic that isn't specifically destined for the proxy service. This reduces attack surface in the appliance and follows a good security principle: If you don't need it, turn it off.

• Question 1085:

  An engineer must configure an OSPF neighbor relationship between router R1 and R3 The authentication configuration has been configured and the connecting interfaces are in the same 192.168 1.0/30 sublet. What are the next two steps to complete the configuration? (Choose two.)

  A. configure the hello and dead timers to match on both sides

  B. configure the same process ID for the router OSPF process

  C. configure the same router ID on both routing processes

  D. Configure the interfaces as OSPF active on both sides.

  E. configure both interfaces with the same area ID

  Correct Answer: AE

  Enabling OSPF SUMMARY STEPS

  1.

  enable

  2.

  configure terminal

  3.

  router ospf process-id

  4.

  network ip-address wildcard-mask area area-id

  5.

  end

  https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-16/iro-xe-16-book/iro-cfg.html#GUID-51A06D7A-7099-453C-A9FD-34CE45080796

• Question 1086:

  What protocol allows an engineer to back up 20 network router configurations globally while using the copy function?

  A. SMTP

  B. SNMP

  C. TCP

  D. FTP

  Correct Answer: B

  It will use SNMP to send a copy command to all the switches, and the copy command will use TFTP to send the config to the TFTP Server.

• Question 1087:

  Which state does the switch port move to when PortFast is enabled?

  A. learning

  B. forwarding

  C. blocking

  D. listening

  Correct Answer: B

• Question 1088:

  What are two roles of Domain Name Services (DNS)? (Choose Two)

  A. builds a flat structure of DNS names for more efficient IP operations

  B. encrypts network Traffic as it travels across a WAN by default

  C. improves security by protecting IP addresses under Fully Qualified Domain Names (FQDNs)

  D. enables applications to identify resources by name instead of IP address

  E. allows a single host name to be shared across more than one IP address

  Correct Answer: DE

• Question 1089:

  How do TCP and UDP differ in the way they guarantee packet delivery?

  A. TCP uses checksum, acknowledgements, and retransmissions, and UDP uses checksums only

  B. TCP uses retransmissions, acknowledgement and parity checks and UDP uses cyclic redundancy checks only.

  C. TCP uses checksum, parity checks, and retransmissions, and UDP uses acknowledgements only.

  D. TCP uses two-dimensional parity checks, checksums, and cyclic redundancy checks and UDP uses retransmissions only.

  Correct Answer: A

  Ref: TCP vs UDP - Difference and Comparison | Diffen Comparison chart

  …

  Error Checking

  TCP does error checking and error recovery. Erroneous packets are retransmitted from the source to the destination.

  UDP does error checking but simply discards erroneous packets. Error recovery is not attempted.

• Question 1090:

  Which configuration ensures that the switch is always the root for VLAN 750?

  A. Switch(config)#spanning-tree vlan 750 priority 38003685

  B. Switch(config)#spanning-tree vlan 750 root primary

  C. Switch(config)#spanning-tree vlan 750 priority 614440

  D. Switch(config)#spanning-tree vlan 750 priority 0

  Correct Answer: D

  In a Spanning Tree Protocol (STP) network, the switch with the lowest bridge priority value is elected as the root bridge for a particular VLAN.

  The lower the bridge priority value, the higher the priority of the switch in the network. Option B sets the bridge priority value to 0, which ensures that the switch is always the root for VLAN 750, regardless of the other switches' bridge priority

  values.

  Option A sets the bridge priority value to 38418607, which is a lower value than the default but may not necessarily guarantee that the switch will always be the root bridge for VLAN 750.

  Option C uses the root primary command, which makes the switch a primary root bridge for all VLANs, not just VLAN 750.

  Option D sets the bridge priority value to 614440, which is higher than the default value and would make the switch less likely to be elected as the root bridge.