Cisco Updated 350-401 Exam Questions and Answers by daria

The issue with the current access list is that it denies all IP traffic before it allows the desired traffic from or to the 192.168.0.0/16 network, due to the sequence of commands in access-list 100. The “10 deny ip any any” command at the beginning of the list is preventing packets from being evaluated by subsequent lines in the access list. By removing this line with option B, “R1(config)#ip access-list extended 100 R1(config-ext-nacl)#no 10”, it will allow for proper evaluation of packets according to lines 20 and 30, which permit traffic to and from the specified network. References: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) study guide; Cisco’s official documentation on configuring IP access lists.

OSPF (Open Shortest Path First) adjacency between R1 and R2 fails due to a timers mismatch. In OSPF, it’s crucial for routers to have matching Hello and Dead intervals to form an adjacency. Ifthese timers do not match, OSPF routers cannot establish an adjacency, leading to failure in exchanging routing information. References: Implementing and Operating Cisco Service Provider Network Core Technologies source documents or study guide

 The issue of tagged packets not passing between SW1 and SW2 is due to the misconfiguration of the native VLAN on interface FastEthernet0/1. In a trunk configuration, it is essential for both ends of the trunk link to have the same native VLAN configured to ensure that untagged frames are correctly identified and forwarded across the trunk link. By configuring the native VLAN to bethe same on both switches, untagged frames can be correctly identified, and tagged packets will pass as expected.

 The command ip http secure-server is used to enable the HTTPS server on a Cisco device, which is necessary for RESTCONF to operate securely. RESTCONF is an HTTP-based protocol that provides a programmatic interface for accessing data defined in YANG, using the datastore concepts defined in NETCONF. Enabling the HTTPS server ensures that RESTCONF can be used over a secure connection, which is a best practice for network security. References: Cisco Programmability Configuration Guide, RESTCONF Protocol Video.