CCNP Enterprise Certification Study Guide: Implementing and Operating Cisco Enterprise Network Core Technologies

Appendix Answers to Review Questions

Chapter 1: Networking Fundamentals

1. B. IEEE 802.3 Ethernet operates at both the Physical and Data Link layers. PPP and HDLC are Data Link layer protocols. Twisted pair is a type of cable; physical media isn't part of the Physical layer.
2. C. PPP is a Data Link layer protocol. IPv4 and OSPF are Network layer protocols. UDP is a Transport layer protocol.
3. A. You'll hear disagreement as to whether ARP is a layer 2 or layer 3 protocol. Some even go so far as to call it a layer 2.5 protocol! ARP packets fit the definition of what the OSI model calls protocol control information. In addition to just providing a mapping between MAC and IP addresses, the fact that a node sends ARP packets indicates its willingness ...