Exam Questions 59-110

A small business is deploying new phones, and some of the phones have full HD videoconferencing features. The Chief Information Officer is concerned that the network might not be able to handle the traffic if the traffic reaches a certain threshold. Which of the following can the network engineer configure to help ease these concerns?

• A VLAN with 100Mbps speed limits

• An IP helper to direct VoIP traffic

• A smaller subnet mask

• Full duplex on all user ports

Answer explanation

Configuring a VLAN with 100Mbps speed limits helps manage bandwidth and control traffic flow, addressing the CIO's concerns about network capacity for videoconferencing. This ensures smoother performance under load.

A virtual machine has the following configuration: IPv4 address: 169.254.10.10 Subnet mask: 255.255.0.0 The virtual machine can reach collocated systems but cannot reach external addresses on the internet. Which of the following is most likely the root cause?

• The subnet mask is incorrect.

• The DHCP server is offline.

• The IP address is an RFC1918 private address.

• The DNS server is unreachable.

Answer explanation

The virtual machine has an IPv4 address in the link-local range (169.254.x.x), indicating it is not receiving a valid IP from a DHCP server. This prevents it from accessing external addresses.

Which of the following is used to estimate the average life span of a device?

• RPO

• RTO

• MTTR

• MTBF

Answer explanation

MTBF (Mean Time Between Failures) is used to estimate the average lifespan of a device by measuring the time between its failures. It helps in understanding reliability and performance over time.

Which of the following is the most secure way to provide site-to-site connectivity?

• VXLAN

• IKE

• GRE

• IPSec

Answer explanation

IPSec is the most secure option for site-to-site connectivity as it provides strong encryption and authentication, ensuring data integrity and confidentiality. Other options like GRE and VXLAN lack built-in security features.

A network technician is terminating a cable to a fiber patch panel in the MDF. Which of the following connector types is most likely in use?

• F-type

• RJ11

• BNC

• SC

Answer explanation

The SC connector is commonly used for fiber optic connections, making it the most likely choice for terminating a cable to a fiber patch panel. The other options (F-type, RJ11, BNC) are not suitable for fiber optics.

A network administrator is connecting two Layer 2 switches in a network. These switches must transfer data in multiple networks. Which of the following would fulfill this requirement?

• Jumbo frames

• 802.1Q tagging

• Native VLAN

• Link aggregation

Answer explanation

802.1Q tagging allows VLANs to be identified on a trunk link between switches, enabling them to transfer data across multiple networks. This is essential for connecting Layer 2 switches in a multi-network environment.

A network administrator wants users to be able to authenticate to the corporate network using a port-based authentication framework when accessing both wired and wireless devices. Which of the following is the best security feature to accomplish this task?

• 802.1X

• Access control list

• Port security

• MAC filtering

Answer explanation

802.1X is the best choice for port-based authentication, allowing users to authenticate on both wired and wireless networks. It provides a secure method for controlling access to the network, unlike the other options.

Which of the following is most closely associated with a dedicated link to a cloud environment and may not include encryption?

• Direct Connect

• Internet gateway

• Captive portal

• VPN

Answer explanation

Direct Connect provides a dedicated link to a cloud environment, allowing for high bandwidth and low latency connections. It typically does not include encryption, unlike VPNs which secure data over public networks.

A systems administrator is investigating why users cannot reach a Linux web server with a browser but can ping the server IP. The server is online, the web server process is running, and the link to the switch is up. Which of the following commands should the administrator run on the server first?

• traceroute

• netstat

• tcpdump

• arp

Answer explanation

The administrator should run 'netstat' first to check if the web server is listening on the correct port (usually 80 or 443). This helps confirm that the web service is properly configured to accept incoming connections.

Which of the following devices can operate in multiple layers of the OSI model?

• Hub

• Switch

• Transceiver

• Modem

Answer explanation

A switch operates at both the Data Link (Layer 2) and Network (Layer 3) layers of the OSI model, allowing it to manage data traffic and make routing decisions. In contrast, hubs, transceivers, and modems operate at lower layers.