Cisco Certifications Tutorials

42 http:\\ciscocertifications.info 68. Which 2 statements are true about IP addressing? A: A host portion of all 1's indicates a network broadcast IP addresses are four octets long and contain a network and a host portion. 69. CSU/DSU is an acronym for which of the following? A: Channel Service Unit - device that connects end-user equipment to the local digital telephone loop. Data Service Unit - used to adapt the physical interface on a DTE device to a circuit like T1. DSU does the signal timing as well. 70. Which IP host address range is allowable given an IP address of 169.73.3.55 using 12 bits of sub- netting? A: 169.73.3.49 through 169.73.3.62 71. CO is an acronym for which of the following? A: Central office 72. What is cut-through switching? A: Packet switching where data is exiting the switch at the same time it is still entering the inbound port. 73. Given an IP host address of 169.61.3.151 and a subnet mask of 255.255.255.192, which subnet does this host belong to? A: 169.61.3.128 74. What does the Spanning-Tree Algorithm (STA) do? A: Implemented by STP to prevent loops by creating a spanning tree. 75. Of the different switching types, which one has the lowest latency? A: Cut-Through 76. Of the different switching types, which one has the highest latency? A: Store-and-Forward 77. To specify all hosts in the class B IP network 172.16.0.0, which wildcard access list mask would you use? A: 0.0.255.255 78. IP extended access lists use what parameters as a basis for permitting or denying packets? A: Source Address Destination Address Port Number Protocol 79. How would you specify only to check host 172.16.30.65 in an IP access list?