Cisco Cisco Certifications CCST-NETWORKING Questions & Answers

• Question 11:

  During the data encapsulation process, which OSI layer adds a header that contains MAC addressing information and a trailer used for error checking?

  A. Network

  B. Transport

  C. Data Link

  D. Session

  Correct Answer: C

  

  OSI model During the data encapsulation process, theData Link layerof the OSI model is responsible for adding a header that contains MAC addressing information and a trailer used for error checking.The header typically includes the source and destination MAC addresses, while the trailer contains a Frame Check Sequence (FCS) which is used for error detection1. The Data Link layer ensures that messages are delivered to the proper device on a LAN using hardware addresses and translates messages from the Network layer into bits for the Physical layer to transmit. It also controls how data is placed onto the medium and is received from the medium through the physical hardware. References: The OSI Model The 7 Layers of Networking Explained in Plain English OSI Model - Network Direction Which layer adds both header and trailer to the data? What is OSI Model | 7 Layers Explained - GeeksforGeeks

• Question 12:

  A local company requires two networks in two new buildings. The addresses used in these networksmust be in the private network range.

  Which two address ranges should the company use? (Choose 2.)

  Note: You will receive partial credit for each correct selection.

  A. 172.16.0.0 to 172.31.255.255

  B. 192.16.0.0 to 192.16.255.255

  C. 11.0.0.0 to 11.255.255.255

  D. 192.168.0.0 to 192.168.255.255

  Correct Answer: AD

  The private IP address ranges that are set aside specifically for use within private networks and not routable on the internet are as follows: Class A: 10.0.0.0 to 10.255.255.255 Class B: 172.16.0.0 to 172.31.255.255 Class C: 192.168.0.0 to 192.168.255.255 These ranges are defined by the Internet Assigned Numbers Authority (IANA) and are used for local communications within a private network123. Given the options: A.172.16.0.0 to 172.31.255.255falls within the Class B private range. B.

  192.16.0.0 to 192.16.255.255is not a recognized private IP range. C.11.0.0.0 to 11.255.255.255is not a recognized private IP range. D.192.168.0.0 to 192.168.255.255 falls within the Class C private range.

  Therefore, the correct selections that the company should use for their private networks are AandD.

  References:

  Reserved IP addresses on Wikipedia

  Private IP Addresses in Networking - GeeksforGeeks Understanding Private IP Ranges, Uses, Benefits, and Warnings

• Question 13:

  Which address is included in the 192.168.200.0/24 network?

  A. 192.168.199.13

  B. 192.168.200.13

  C. 192.168.201.13

  D. 192.168.1.13

  Correct Answer: B

  192.168.200.0/24 Network: This subnet includes all addresses from 192.168.200.0 to 192.168.200.255. The /24 indicates a subnet mask of 255.255.255.0, which allows for 256 addresses.

  192.168.199.13: This address is in the 192.168.199.0/24 subnet, not the 192.168.200.0/24 subnet.

  192.168.200.13: This address is within the 192.168.200.0/24 subnet. ?92.168.201.13: This address is in the 192.168.201.0/24 subnet, not the 192.168.200.0/24 subnet.

  192.168.1.13: This address is in the 192.168.1.0/24 subnet, not the 192.168.200.0/24 subnet.

  References:

  Subnetting Guide: Subnetting Basics

• Question 14:

  You need to connect a computer's network adapter to a switch using a 1000BASE-T cable.

  Which connector should you use?

  A. Coax

  B. RJ-11

  C. OS2 LC

  D. RJ-45

  Correct Answer: D

  -1000BASE-T Cable: This refers to Gigabit Ethernet over twisted-pair cables (Cat 5e or higher).

  -Connector: RJ-45 connectors are used for Ethernet cables, including those used for 1000BASE-T.

  -Coax: Used for cable TV and older Ethernet standards like 10BASE2.

  -RJ-11: Used for telephone connections.

  -OS2 LC: Used for fiber optic connections.

  References:

  -Ethernet Standards and Cables: Ethernet Cable Guide

• Question 15:

  Which component of the AAA service security model provides identity verification?

  A. Authorization

  B. Auditing

  C. Authentication

  D. Accounting

  Correct Answer: C

  The AAA service security model consists of three components: Authentication, Authorization, and Accounting.

  -Authentication: This is the process of verifying the identity of a user or device. It ensures that only legitimate users can access the network or service.-Authorization: This determines what an authenticated user is allowed to do or access

  within the network.

  -Auditing/Accounting: This component tracks the actions of the user, including what resources they access and what changes they make.

  Thus, the correct answer is C. Authentication.

  References :

  -Cisco AAA Overview

  -Understanding AAA (Authentication, Authorization, and Accounting)

• Question 16:

  A support technician examines the front panel of a Cisco switch and sees 4 Ethernet cables connected in the first four ports. Ports 1, 2, and 3 have a green

  LED. Port 4 has a blinking green light.

  What is the state of the Port 4?

  A. Link is up with cable malfunctions.

  B. Link is up and not stable.

  C. Link is up and active.

  D. Link is up and there is no activity.

  Correct Answer: C

  On a Cisco switch, a port with a blinking green LED typically indicates that the port is up (active) and is currently transmitting or receiving data. This is a normal state indicating active traffic on the port.

  -A. Link is up with cable malfunctions: Usually indicated by an amber or blinking amber light.

  -B. Link is up and not stable: Not typically indicated by a green blinking light.

  -D. Link is up and there is no activity: Would be indicated by a solid green light withoutblinking.

  Thus, the correct answer is C. Link is up and active.

  References:

  -Cisco Switch LED Indicators

  -Cisco Ethernet Switch LED Patterns

• Question 17:

  What is the purpose of assigning an IP address to the management VLAN interface on a Layer 2 switch?

  A. To enable the switch to act as a default gateway for the attached devices

  B. To enable the switch to resolve URLs for the attached the devices

  C. To enable the switch to provide DHCP services to other switches in the network

  D. To enable access to the CLI on the switch through Telnet or SSH

  Correct Answer: D

  The primary purpose of assigning an IP address to the management VLAN interface on a Layer 2 switch is to facilitate remote management of the switch. By configuring an IP address on the management VLAN, network administrators can

  access the switch's Command Line Interface (CLI) remotely using protocols such as Telnet or Secure Shell (SSH). This allows for convenient configuration changes, monitoring, and troubleshooting without needing physical access to the

  switch1.

  References:

  -Understanding the Management VLAN

  -Cisco - VLAN Configuration Guide

  -Remote Management of Switches

  Assigning an IP address to the management VLAN interface (often the VLAN 1 interface by default) on a Layer 2 switch allows network administrators to remotely manage the switch using protocols such as Telnet or SSH. This IP address

  does not affect the switch's ability to route traffic between VLANs but provides a means to access and configure the switch through its Command Line Interface (CLI).

  -A: The switch does not act as a default gateway; this is typically a function of a Layer 3 device like a router.

  -B: The switch does not resolve URLs; this is typically a function of DNS servers.

  -C: The switch can relay DHCP requests but does not typically provide DHCP services

  itself; this is usually done by a dedicated DHCP server or router.

  Thus, the correct answer is D. To enable access to the CLI on the switch through Telnet or SSH.

  References :

  -Cisco VLAN Management Overview

  -Cisco Catalyst Switch Management

• Question 18:

  Which command will display the following output?

  

  A. show mac-address-table

  B. show cdp neighbor

  C. show inventory

  D. show ip interface

  Correct Answer: B

  The command that will display the output provided, which includes capability codes, local interface details, device IDs, hold times, and platform port ID capabilities, is the show cdp neighbor command. This command is used in Cisco devices

  to display current information about neighboring devices detected by Cisco Discovery Protocol (CDP), which includes details such as the interface through which the neighbor is connected, the type of device, and the port ID of the device1.

  References:

  -Cisco - show cdp neighbors

  The provided output is from the Cisco Discovery Protocol (CDP) neighbor table. The show cdp neighbor command displays information about directly connected Cisco devices, including Device ID, Local Interface, Holdtime, Capability,

  Platform, and Port ID.

  -A. show mac-address-table: Displays the MAC address table on the switch.

  -C. show inventory: Displays information about the hardware inventory of the device.

  -D. show ip interface: Displays IP interface status and configuration.

  Thus, the correct answer is B. show cdp neighbor.

  References:

  -Cisco CDP Neighbor Command

  -Understanding CDP

• Question 19:

  Which standard contains the specifications for Wi-Fi networks?

  A. GSM

  B. LTE

  C. IEEE 802.11

  D. IEEE 802.3

  E. EIA/TIA 568A

  Correct Answer: C

  The IEEE 802.11 standard contains the specifications for Wi-Fi networks. It is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) computer communication in various frequencies, including but not limited to 2.4 GHz, 5 GHz, and 6 GHz1. This standard is maintained by the Institute of Electrical and Electronics Engineers (IEEE) and is commonly referred to as Wi-Fi. The standard has evolved over time to include several amendments that improve speed, range, and reliability of wireless networks.

  References: -The Most Common Wi-Fi Standards and Types, Explained -802.11 Standards Explained: 802.11ax, 802.11ac, 802.11b/g/n, 802.11a -Wi-Fi Standards Explained - GeeksforGeeks

• Question 20:

  Examine the following output:

  

  Which two conclusions can you make from the output of the tracert command? (Choose 2.)

  Note: You will receive partial credit for each correct answer.

  A. The trace successfully reached the www.cisco.com server.

  B. The trace failed after the fourth hop.

  C. The IPv6 address associated with the www.cisco.com server is 2600:1408: c400: 38d: : b33.

  D. The routers at hops 5 and 6 are offline.

  E. The device sending the trace has IPv6 address 2600:1408:c400:38d :: b33.

  Correct Answer: AC

  -Statement A: "The trace successfully reached the www.cisco.com server." This is true as indicated by the "Trace complete" message at the end, showing that the trace has reached its destination. -Statement C: "The IPv6 address associated

  with the www.cisco.com server is 2600:1408:c400:38d::b33." This is true because the final hop in the trace, which is the destination, has this IPv6 address.

  -Statement B: "The trace failed after the fourth hop." This is incorrect as the trace continues beyond the fourth hop, despite some intermediate timeouts. -Statement D: "The routers at hops 5 and 6 are offline." This is not necessarily true. The

  routers might be configured to not respond to traceroute requests.

  -Statement E: "The device sending the trace has IPv6 address 2600:1408:c400:38d::b33."

  This is incorrect; this address belongs to the destination server, not the sender.

  References:

  -Understanding Traceroute: Traceroute Guide