subject: 642-832 Questions And Answers [print this page] Exam : Cisco 642-832 Exam Title : Troubleshooting and Maintaining Cisco IP Networks 1. At which layer of the OSI model does the Spanning Tree Protocol (STP) operate at? A. Layer 5 B. Layer 4 C. Layer 3 D. Layer 2 E. Layer 1 Answer: D 2. In computer networking a multicast address is an identifier for a group of hosts that have joined a multicast group. Multicast addressing can be used in the Link Layer (OSI Layer 2), such as Ethernet Multicast, as well as at the Internet Layer (OSI Layer 3) as IPv4 or IPv6 Multicast. Which two descriptions are correct regarding multicast addressing? A. The first 23 bits of the multicast MAC address are 001-00-5 E. This is a reserved value that indicates a multicast application. B. The last 3 bytes (24 bits) of the multicast MAC address are 001-00-5 E. This is a reserved value that indicates a multicast application. C. To calculate the Layer 2 multicast address, the host maps the last 23 bits of the IP address into the last 24 bits of the MAC address. The high-order bit is set to 0. D. The first 3 bytes (24 bits) of the multicast MAC address are 001-00-5 E. This is a reserved value that indicates a multicast application. Answer: CD 3. Part of the routing table of router Cisco1 is displayed below: From analyzing the above command output, what is the administrative distance of the external EIGRP routes? A. 24 B. 32 C. 90 D. 170 E. 27316 F. None of the other alternatives apply Answer: D
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