Cisco Updated 350-401 Exam Questions and Answers by ivan

 The correct answer is A, 192.0.2.1. According to RFC 5737, the virtual IP address used in the configuration of Local WebAuth on a Cisco Wireless LAN Controller should be from the block of addresses reserved for documentation and example code, which includes the 192.0.2.0/24 range. This ensures that there is no conflict with real IP addresses in use on the network. References: This is supported by the Cisco documentation on configuring virtual interfaces, which recommends using a non-routable IP address from the RFC5737 ranges for the virtual interface to avoid conflicts with network infrastructure addresses2.

An OVF, or Open Virtualization Format, is a package format that allows for the distribution of virtual appliances or virtual machines. It is platform-independent and can include one or more virtual disks and a VM configuration file (typically an .ovf or .ova file). The OVF package can be used to easily deploy complex multi-tier applications across different virtualization platforms.

References: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) course materials

Causes of Errdisable

This feature was first implemented in order to handle special collision situations in which the switch detected excessive or late collisions on a port. Excessive collisions occur when a frame is dropped because the switch encounters 16 collisions in a row. Late collisions occur after every device on the wire should have recognized that the wire was in use. Possible causes of these types of errors include:

A cable that is out of specification (either too long, the wrong type, or defective)

A bad network interface card (NIC) card (with physical problems or driver problems)

A port duplex misconfiguration

A port duplex misconfiguration is a common cause of the errors because of failures to negotiate the speed and duplex properly between two directly connected devices (for example, a NIC that connects to a switch). Only half-duplex connections should ever have collisions in a LAN. Because of the carrier sense multiple access (CSMA) nature of Ethernet, collisions are normal for half duplex, as long as the collisions do not exceed a small percentage of traffic.

 In BGP, the Multi-Exit Discriminator (MED) attribute is used to inform external neighbors about the preferred path into an AS when multiple entry points exist. A lower MED value is preferred over a higher one. Therefore, if RouterDAL advertises a route to the 10.0.0.0/24 network with a lower MED compared to RouterCHI, RouterSF will choose the route from RouterDAL. This is assuming all other attributes are equal and there is no more specific route or policy in place that would override the MED consideration.