100-150 Infrastructure — All Questions With Answers

Which component of the Cisco network architecture is responsible for providing high-speed switching and fast transport between different areas of the network?

Question 2easymultiple choice

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A technician is connecting a new Cisco Catalyst access switch to an existing IDF patch panel. The run to the distribution switch is approximately 60 meters through a cable tray that also carries fluorescent lighting ballasts. The technician needs a cable that supports 1 Gbps and is immune to the electromagnetic interference generated in the tray. Which cable type should be used?

Question 3hardmulti select

A network engineer is designing a small office network that requires high-speed connections between switches and to a server. The engineer wants to use Ethernet technology that supports full-duplex communication and can operate over twisted-pair copper cabling. Which two Ethernet standards meet these requirements? (Choose two.)

Question 4hardmultiple choice

A network administrator is troubleshooting connectivity issues on a Cisco switch. A workstation connected to port FastEthernet 0/5 cannot reach the file server on the same VLAN. The administrator runs the 'show interface FastEthernet 0/5' command and sees the following output: 'FastEthernet0/5 is up, line protocol is down'. What is the most likely cause of the problem?

Question 5mediummultiple choice

A network administrator is planning the IPv4 addressing for a small branch office that will contain 45 hosts on a single subnet. The administrator wants to conserve addresses and use the smallest subnet mask that still accommodates all hosts. Which subnet mask should be configured?

Question 6hardmultiple choice

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A network administrator is configuring a Cisco router interface that connects to an ISP. The link must obtain its IPv4 address automatically from the provider rather than using a static configuration. Which command should be applied to the interface to accomplish this?

Question 7mediummultiple choice

A network technician is connecting a new Cisco Catalyst switch to an existing switch using a copper cable. The link fails to come up, and the interface status shows 'notconnect'. The technician verifies the cable is a straight-through Ethernet cable and that both switches use auto-MDIX. Which action should the technician take to resolve the problem?

Question 8hardmultiple choice

A network administrator is configuring a Cisco switch and needs to ensure that only the MAC address 00:1A:2B:3C:4D:5E is allowed to send traffic on interface GigabitEthernet0/1. The administrator also wants the interface to automatically shut down if a different MAC address is detected. Which command sequence should be used?

Question 9mediummultiple choice

A network administrator needs to connect a workstation to a Cisco switch. Which cabling standard and medium should be utilized to ensure full-duplex communication while preventing collision domains?

Question 10easymultiple choice

Which device is primarily responsible for managing traffic between different IP subnets in a corporate network?

Question 11mediummulti select

Which TWO functions are performed by a Cisco switch at the Data Link layer? (Choose two.)

Question 12hardmulti select

Which THREE factors influence the selection of a specific router interface for traffic forwarding? (Choose three.)

Question 13mediummultiple choice

An administrator wants to implement a security policy that prevents unauthorized devices from accessing the network via open switch ports. Which feature should be enabled to achieve this?

Question 14mediummultiple choice

Which primary benefit does the implementation of VLANs provide to a corporate network infrastructure?

Question 15easymultiple choice

Which transmission medium is best suited for long-distance data communication with high immunity to electromagnetic interference?

Question 16mediummultiple choice

What is the function of the Default Gateway in an IP configuration?

Question 17mediummulti select

Which TWO protocols are commonly used to remotely manage Cisco network devices? (Choose two.)

Question 18easymultiple choice

Open the full STP breakdown →

What is the primary function of a network switch's 'store-and-forward' switching method?

Question 19hardmultiple choice

Which mechanism does the Spanning Tree Protocol (STP) use to detect and prevent Layer 2 loops in a network with redundant links?

Question 20mediummultiple choice

An enterprise network administrator needs to deploy a secure out-of-band management network for enterprise switches and routers. Which infrastructure design approach provides the highest level of isolation and security?

Question 21hardmultiple choice

A network engineer is troubleshooting high CPU utilization on a core switch caused by excessive broadcast traffic across multiple VLANs. Which infrastructure technology should be deployed to contain broadcast domains while maintaining Layer 3 connectivity?

Question 22mediummulti select

An organization is designing a redundant campus distribution layer to ensure high availability and fast failover. Which TWO infrastructure features should be implemented to achieve sub-second convergence and eliminate routing loops? (Choose two)

Question 23easymultiple choice

Which cabling infrastructure standard should an engineer deploy to support 10 Gigabit Ethernet transmissions across a 300-meter horizontal run inside a modern enterprise building?

Question 24hardmultiple choice

Refer to the exhibit. An engineer observes that the interface status for Vlan100 is listed as 'up' but the protocol status is 'down'. What is the most likely root cause of this operational state?

Exhibit

Switch# show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
GigabitEthernet0/1         192.168.1.2     YES NVRAM  up                    up
Vlan100                    10.10.10.1      YES manual up                    down
Serial0/0/0                unassigned      YES unset  administratively down down

Question 25mediummultiple choice

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An administrator is configuring Power over Ethernet on an enterprise access switch to power IP security cameras requiring up to 25.5 watts of power each. Which IEEE standard must the switch ports support?

Question 26mediummultiple choice

An enterprise network design incorporates Power over Ethernet to supply power to VoIP desk phones and wireless access points. A technician notes that the power supply unit inside the switch is operating near maximum capacity. Which feature should be configured to prevent unexpected power drops?

Question 27mediummultiple choice

A network administrator needs to connect two switches using a link that allows multiple VLANs to traverse a single physical path. Which configuration step is essential to ensure this functionality is enabled properly?

Question 28hardmultiple choice

Refer to the exhibit. An administrator observes high error counts on a switch port. Based on the output, what is the most likely cause of the issue?

Exhibit

Switch# show interface fastEthernet 0/1
FastEthernet0/1 is up, line protocol is up (connected)
Duplex is Full, Speed is 100Mb/s, 500 error packets input
Input errors 500, CRC 450, frame 50

Question 29mediummulti select

Which TWO of the following are primary benefits of implementing a hierarchical network design like the Cisco Three-Tier Model?

Question 30easymultiple choice

Which device is primarily responsible for performing inter-VLAN routing in a modern enterprise network?

Question 31mediummultiple choice

What is the primary purpose of a default gateway in an IP host configuration?

Question 32mediummultiple choice

Which type of cabling is best suited for long-distance data transmission that requires high bandwidth and is immune to electromagnetic interference?

Question 33hardmultiple choice

Refer to the exhibit. If a third device with a different MAC address is connected to this port, what will occur?

Exhibit

interface GigabitEthernet0/1
switchport mode access
switchport access vlan 10
switchport port-security
switchport port-security maximum 2
switchport port-security violation shutdown

Question 34mediummultiple choice

Which protocol is used to provide dynamic, automatic configuration of VLANs across a domain of switches?

Question 35hardmulti select

Which THREE of the following are characteristics of the Cisco IOS CLI environment that facilitate efficient network administration?

Question 36mediummultiple choice

A switch is experiencing high levels of broadcast traffic. Which technology can be used to divide the switch into smaller, independent broadcast domains?

Question 37easymultiple choice

What is the primary function of the 'show running-config' command on a Cisco switch?

Question 38mediummultiple choice

Open the full STP breakdown →

Which component of the Cisco network architecture is specifically designed to provide high-speed switching and fast transport between different parts of the network?

Question 39mediummultiple choice

What is the primary function of the Spanning Tree Protocol (STP) in a network with redundant links?

Question 40hardmultiple choice

Refer to the exhibit. What can be determined about the status of interface FastEthernet 0/1?

Exhibit

Switch# show ip interface brief
Interface    IP-Address    OK?    Method    Status        Protocol
FastEther0/1  10.1.1.1      YES    manual    up            up
FastEther0/2  unassigned    YES    unset     down          down

Question 41mediummultiple choice

A technician connects a new laptop to a Cisco Catalyst switch. The switch receives a frame destined for a MAC address that is not currently present in its MAC address table. What action will the switch take to ensure the frame reaches its intended destination?

Question 42mediummultiple choice

A network technician is configuring a new Cisco switch port for a server that must support both voice and data traffic on separate VLANs. The server's network interface card is VLAN-aware and will tag its own frames. The technician wants to ensure the switch port can carry traffic for multiple VLANs. Which type of switch port configuration should the technician apply?

Question 43mediummultiple choice

A network technician is configuring a new Cisco switch and needs to assign an IP address to the management VLAN interface so the switch can be reached remotely via SSH. The switch currently has no VLAN interfaces configured. Which command must the technician use to create the management interface and enter interface configuration mode?

Question 44easymultiple choice

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A network administrator is setting up a small office network with a Cisco router and several switches. The administrator wants to ensure that devices on the local network can communicate with each other and access the internet. Which IP address configuration parameter must be set on each device to allow communication with remote networks?

Question 45mediummultiple choice

A network technician connects a new Cisco Catalyst switch to an existing production switch using a copper straight-through cable. The link lights on both ends remain off, and the technician confirms the cable is functional. The technician then replaces the cable with a crossover cable, and the link comes up. What is the most likely reason the straight-through cable failed to establish a link?

Question 46easymultiple choice

A user reports that they cannot access any network resources, including the internet. A technician checks the user's workstation and finds that it has an IP address of 169.254.10.5 with a subnet mask of 255.255.0.0. The technician verifies that the switch port is active and the cable is connected. What is the most likely cause of the problem?

Question 47easymultiple choice

A network administrator is setting up a small office network with a single Cisco router and multiple switches. The administrator wants to ensure that devices on different VLANs can communicate with each other. Which feature should be configured on the router?

Question 48mediummulti select

A network engineer is deploying a new Cisco switch and needs to configure it for remote management. The engineer wants to ensure that management traffic is isolated from user data traffic and that only authorized personnel can access the switch. Which two configuration steps should the engineer perform? (Choose two.)

Question 49mediummultiple choice

A network administrator is configuring a Cisco switch and wants to ensure that only the MAC addresses of known devices are allowed to send traffic on a specific access port. The administrator wants to manually specify the allowed MAC addresses and have the port shut down if a violation occurs. Which feature should be configured?

Question 50hardmultiple choice

A network engineer is configuring a Cisco switch and needs to ensure that only the MAC address 00:1A:2B:3C:4D:5E is allowed to communicate through interface GigabitEthernet0/1. The engineer enters the command 'switchport port-security mac-address 00:1A:2B:3C:4D:5E' on the interface. However, the switch rejects the command. What is the most likely cause?

Question 51mediummultiple choice

A small branch office has a Cisco Layer 2 access switch with three access ports assigned to VLAN 10 for the sales team and two access ports assigned to VLAN 20 for the finance team. The finance team reports that they cannot reach the sales team's shared file server, even though both teams are connected to the same physical switch. No router or Layer 3 switch is deployed at this branch. What is the most likely explanation for the connectivity failure?

Question 52mediummultiple choice

A network administrator is troubleshooting a connectivity issue between two hosts on the same VLAN. The administrator uses the 'show mac address-table' command on the switch and notices that the MAC address of one host appears on multiple ports. What is the most likely cause of this behavior?

Question 53hardmultiple choice

A network administrator is troubleshooting a connectivity issue between two switches connected via a trunk link. The administrator notices that the trunk link is up, but VLAN 10 traffic is not passing. The administrator runs the show interfaces trunk command and sees that VLAN 10 is not listed in the 'VLANs allowed and active in management domain' output. What is the most likely cause?

Question 54easymultiple choice

A technician is deploying a new Cisco switch in a wiring closet and needs to connect it to a distribution switch so that it can carry traffic for VLAN 5, VLAN 15, and VLAN 25 between the two devices. The link must carry frames from all three VLANs simultaneously. Which type of port configuration should be applied to the uplink interface on both switches?

Question 55mediummulti select

A network technician is configuring a new Cisco switch for a small business. The technician needs to ensure that the switch can be managed remotely from a different subnet. Which TWO configurations are required to enable remote management access? (Choose two.)

Question 56mediummultiple choice

A network technician is configuring a Cisco switch for a new VLAN. The technician wants to verify that the VLAN has been created and is active, and also see which ports are assigned to it. Which command should the technician use?

Question 57mediummulti select

A network engineer is reviewing how a Cisco switch builds and maintains its MAC address table as frames arrive from attached devices. Which TWO statements correctly describe this Layer 2 forwarding behavior? (Choose two.)

Question 58hardmultiple choice

A network administrator is reviewing the MAC address table on a Cisco access switch and notices that the same MAC address appears on two different access ports in the same VLAN. The administrator confirms that the device with that MAC address is connected to only one port. What is the most likely cause of this duplicate entry?

Question 59mediummultiple choice

A network engineer is configuring a Cisco router interface that connects to an ISP. The ISP has assigned the engineer a single public IP address of 203.0.113.10 with a subnet mask of 255.255.255.252 and a default gateway of 203.0.113.9. The engineer needs to configure the router interface with the correct IP address and mask. Which configuration should be applied?

Question 60mediummulti select

A network administrator is deploying a new Cisco switch in a small office and wants to apply basic security hardening to protect the management plane. The administrator plans to restrict remote access and prevent unauthorized configuration changes. Which two actions should the administrator take to secure management access to the switch? (Choose two.)

Question 61mediummultiple choice