200-901 Network Fundamentals Practice Test 2 — 15 Questions

Question 1

A network engineer is troubleshooting an issue where hosts in VLAN 100 cannot reach a server at 10.1.1.100. The switch interfaces are configured as access ports in VLAN 100, and the default gateway is 10.1.1.1. The engineer checks the switch and finds that the ARP table does not contain the server's MAC address. Which two actions should the engineer take to resolve the issue? (Choose two.)

Accepted Answer

Check the ARP table on the default gateway router.. Option E is correct because if the switch port connected to the server is not in VLAN 100, the server will be in a different broadcast domain and will not receive ARP requests from hosts in VLAN 100. This would cause the ARP table on the switch to lack the server's MAC address, as the switch cannot learn it through normal Layer 2 flooding within the VLAN.

Answer

Ping the server's IP address from the switch management interface.

Answer

Ping the default gateway from a host in VLAN 100.

Answer

Check the MAC address table on the switch for the server's MAC.

Question 2

Refer to the exhibit. A switch is configured with the shown trunk port. After connecting the uplink, the switch logs show repeated 'errdisable' state transitions on this port. The core switch is configured with the same allowed VLAN list. Which configuration change is most likely to resolve the issue?

Accepted Answer

Remove the spanning-tree portfast trunk command from the interface.. The 'errdisable' state transitions on a trunk port are typically caused by a spanning-tree BPDU guard violation when PortFast is enabled. The 'spanning-tree portfast trunk' command enables PortFast on the trunk, which bypasses the normal listening/learning states and can cause the port to be placed into errdisable state if a BPDU is received from the core switch. Removing this command allows the trunk port to participate in standard spanning-tree convergence, preventing the repeated errdisable transitions.

Answer

Change the switchport mode to dynamic desirable.

Answer

Add VLAN 1 to the allowed VLAN list.

Answer

Add the spanning-tree bpduguard enable command to the interface.

Question 3

A network administrator is deploying a new application that requires high availability and load balancing across multiple servers. The servers are connected to a pair of switches that use StackWise virtual technology. The application team requests that the servers be configured with NIC teaming in active-active mode. Which two requirements must be met for this configuration to work correctly? (Choose two.)

Accepted Answer

The two switches must be part of a single stack or virtual switch fabric.. Option A is correct because StackWise virtual technology logically combines two physical switches into a single control plane, allowing NIC teaming in active-active mode to treat the pair as one logical switch. This ensures that both NIC team members can forward traffic simultaneously without loops, as the stack provides a unified Layer 2 topology and prevents MAC flapping between the two switches.

Answer

Spanning-tree PortFast must be enabled on the switch ports connected to the servers.

Answer

The NIC team must use LACP for load balancing.

Answer

Both NIC team members should connect to the same switch module for consistency.

Question 4

Drag and drop the steps to configure a Cisco switch for remote management (SSH) into the correct order.

Question 5

Match each Cisco platform to its primary use case.

Question 6

An engineer needs to identify which hosts are reachable in a 10.0.0.0/24 network using an automated script that does not require any credentials on the target devices. Which protocol is best suited for this task?

Accepted Answer

ICMP. ICMP (Internet Control Message Protocol) is the correct choice because it provides the Echo Request and Echo Reply messages (commonly used by the 'ping' command) that can determine host reachability without requiring any authentication or credentials on the target devices. This makes ICMP ideal for an automated script that needs to probe a 10.0.0.0/24 network for live hosts, as it operates at the network layer and only requires IP connectivity.

Answer

CDP

Answer

SNMP

Answer

ARP

Question 7

A developer is writing an application that needs to send a large amount of data reliably over a network. Which transport layer protocol should the developer use?

Accepted Answer

TCP. TCP (Transmission Control Protocol) is the correct choice because it provides reliable, connection-oriented data delivery with acknowledgments, retransmission, and sequencing. This ensures that large amounts of data are transmitted without loss or corruption, which is critical for applications requiring data integrity.

Answer

ICMP

Answer

HTTP

Answer

UDP

Question 8

A network automation script uses RESTCONF to configure a router. The script receives an HTTP 409 Conflict response. What is the most likely cause?

Accepted Answer

The resource already exists. RESTCONF uses HTTP status codes to indicate the result of an operation. An HTTP 409 Conflict specifically means the request could not be completed due to a conflict with the current state of the resource. In the context of a network automation script using RESTCONF to configure a router, this most commonly occurs when the script attempts to create a resource (e.g., an interface or VLAN) that already exists, violating the resource's uniqueness constraint.

Answer

The router is unreachable

Answer

The request body is malformed

Answer

Incorrect authentication

Question 9

An engineer wants to verify that a switch port is configured as an access port in VLAN 10. Which command provides this information?

Accepted Answer

show running-config interface. The `show running-config interface` command displays the current operational configuration of a specific interface, including whether it is configured as an access port and which VLAN it is assigned to. For a switch port in VLAN 10, the output will show `switchport mode access` and `switchport access vlan 10`, directly confirming the desired configuration.

Answer

show interfaces status

Answer

show ip interface brief

Answer

show vlan brief

Question 10

A company has multiple subnets. A device in subnet 192.168.1.0/24 needs to communicate with a device in subnet 192.168.2.0/24. What is required for this communication?

Accepted Answer

A router or Layer 3 switch. Devices in different subnets (192.168.1.0/24 and 192.168.2.0/24) are on separate Layer 3 networks. To forward packets between these subnets, a router or Layer 3 switch is required to perform IP routing, using the destination IP address to determine the next hop. Without a Layer 3 device, the frames cannot leave the local broadcast domain.

Answer

A DNS server

Answer

A VLAN

Answer

A bridge

Question 11

An application sends a packet with destination IP 10.0.0.10. The sending host's routing table has a default gateway of 10.0.0.1. The host's ARP cache is empty. What is the next step after the host determines the packet should go to the default gateway?

Accepted Answer

Sends an ARP request for 10.0.0.1. When the host determines that the destination IP (10.0.0.10) is not on the same subnet and must be sent to the default gateway (10.0.0.1), it needs the gateway's MAC address to encapsulate the packet in a Layer 2 frame. Since the ARP cache is empty, the host must send an ARP request for the IP address of the default gateway (10.0.0.1) to obtain its MAC address before the packet can be forwarded.

Answer

Sends the packet to the DNS server

Answer

Sends the packet directly to 10.0.0.10

Answer

Sends an ARP request for 10.0.0.10

Question 12

Which IPv6 address type is equivalent to a private IPv4 address?

Accepted Answer

Unique local. Unique local addresses (ULA) in IPv6, defined in RFC 4193, are the equivalent of private IPv4 addresses (RFC 1918) because they are intended for local communication within a site or organization and are not routable on the global internet. They use the prefix fc00::/7, with the L bit set to 1 (fd00::/8) for locally assigned addresses, ensuring uniqueness within a site without requiring global registration.

Answer

Multicast

Answer

Global unicast

Answer

Link-local

Question 13

An engineer needs to transfer a router configuration file to a server in the same network using a simple protocol that does not require authentication. Which protocol is best?

Accepted Answer

TFTP. TFTP (Trivial File Transfer Protocol) is the best choice because it is a lightweight, connectionless protocol that operates over UDP (port 69) and does not require any authentication or user credentials. It is commonly used for transferring router configuration files and IOS images in local network environments where simplicity and speed are prioritized over security.

Answer

SCP

Answer

FTP

Answer

HTTP

Question 14

A developer is building a chat application that requires low-latency communication, and occasional packet loss is acceptable. Which transport protocol should the developer choose?

Accepted Answer

UDP. UDP is the correct choice because it provides low-latency, connectionless communication without retransmission or congestion control, making it ideal for real-time chat applications where occasional packet loss is acceptable. Unlike TCP, UDP does not require a handshake or acknowledgment, minimizing delay and overhead.

Answer

RTP

Answer

QUIC

Answer

TCP

Question 15

Which TWO of the following are examples of application layer protocols?

Accepted Answer

HTTP. HTTP (Hypertext Transfer Protocol) operates at the application layer (Layer 7) of the OSI model, enabling web browsers and servers to exchange hypertext documents. It defines how requests and responses are formatted and transmitted, relying on lower-layer protocols like TCP for reliable delivery.

Answer

IP

Answer

TCP

Answer

ARP