Cisco Systems manual What is a backoff on an 802.3 network?, Answer C

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640 - 607

Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 163-165.

Q. 126

What is a backoff on an 802.3 network?

A.It is latency in store and forward switching.

B.It is the time used for token passing for machine to machine.

C.It is the retransmission delay that is reinforced when a collision occurs.

D.It is the result of two nodes transmitting at a same time the frames from each transmitting device collide and are damaged.

Answer: C

Explanation: Backoff is done when a collision occurs. Those trying to transmit at the same time “back-off” and attempt to retransmit at a later time. A 802.3 network uses collision detection, so that the transmitters are notified of the collision. Then using a random calculated wait time, re-transmission occurs. By using a random wait time, hopefully both transmitter wait a different amount of time and do not attempt simultaneous transmission again.

Incorrect Answers:

A is incorrect; back off occurs after a collision has occurred and is not latency stored and forward switching. B is incorrect; has nothing to do with the passing of the token.

D is incorrect; back off is used to prevent another collision.

Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 16-17.

Q. 127

You have just issued an erase startup-config command and reloaded your router. In which mode will your router be when you reboot?

A.Setup.

B.Startup.

C.User EXEC.

D.User privileged.

E.Global configuration.

Answer: A

Explanation: When a router is booted, it will copy the startup-config from NVRAM to the RAM and begin execution. Since the erase wiped out the startup configuration, the router can’t start. This forces the router into setup mode, where a configuration has to be built from by scratch.

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Contents Ccna Important Note Please Read Carefully Which command displays the configuration register setting? Answer DIncorrect Answers Answer D ExplanationAnswer C Explanation Answer B ExplanationExhibit Answer a Explanation Answer B During encapsulation in which order is information packaged? Answer CAnswer E Explanation Answer A, B, E Answer F Explanation What is the result of segmenting a network with a bridge? Answer aPhysical layer Data layer Network layer Transport layer Host 1-1 can ping Host Answer A, B and E Answer B, D, FAnswer A, B, D 640 Answer A, D, F Answer B, C, E Answer A, D Cable #1 Cable #2 Cable #3 Cable #4 Answer A, B 640 Answer D What is the likely cause of this problem? Answer A, C, D Answer Answer B, F 640 RIP Ospf Eigrp Igrp Answer Explanation Answer A, B, D, E Answer D Is incorrect this is not a valid command Answer B Answer D Answer A, C, D, E Which of the following are true? Answer EWhat is a benefit of a virtual LAN VLAN? Answer C, D Answer B Given the configuration example Answer D, E Explanation Answer A, E, F How does inter-VLAN communication take place? Which two statements about IP RIP are true? Choose twoAnswer D, F Answer A, B, C, and D CSMA/CD Answer A, D Which two statements about a bridge are true. Choose two Which statement about an IP network is true? 10.0.0.0 to 172.16.0.0 to 192.168.0.0 to Answer A, B, C, GExplanation Which statement is true? Answer A, B, D Explanation Incorrect OptionsAnswer A, C, E Answer a and B Which two protocol tools use ICMP? Choose twoWhich command successfully ping an individual IP address? Answer A, COne Two None Several Which commands should you use to enable Igrp routing? Answer E Answer A, B, C Explanation Answer B, D Answer A, B, CWhat is the bandwidth capacity of an Isdn B channel? Answer a Which statement about Ethernet networks is true? What is the distance limitation for 100BaseT? Which command sets the clock rate to 56 Kbps on serial0? Setup dialogue what do the square bracket indicate? Which command retrieves the configuration file from NVRAM? What is the most common Layer 2 device? SAP Hdlc ARP Novellether Answer a Answer D Answer A, C What are two components of an IPX address? Answer B, C Explanation Answer C, D, E, F Answer F Which two statements are true? Choose two Answer a and dWhat is a backoff on an 802.3 network? What is a key use of a device hardware address? 16,382 65,534 Session Network Transport Maintenance 640 Answer A, C Explanation What are the characteristics of UDP? MAC LLC SAP LCP Tab Ctrl R Spacebar Right Arrow PPP Lapd Isdn Hdlc Answer B, C What does the command show access-list 101 list?Which two commands show your access lists? Choose two IP and IPX IP and PPP PPP and Sdlc PPP and Hdlc 640 Answer C, D, E Explanation What are two functions of Icmp protocol? Choose TwoAnswer D, E 172.37.2.55 to What does the term ‘Base’ refer to in 100BaseT? Click the task button & Place the encapsulation Answer Explanation IP-Space enable When you issue the command show version, your router returns From where does the router boot?101 What is the most common mail to device? 103 104 105 106 Which statement about Ethernet switches is true? 108 109 110 111 Answer A, B, F 113 You just entered the following command Which operation is most likely to follow?115 Answer A, B, C, D What is back off on an 802.3 network? 118 Which command displays access list 111? Answer B, E120 121 122 123 124 125 126 Answer E, F, G 128 Answer A, D Explanation 130 What is an advantage of local area network LAN segmentation? What are the generic parts of a network layer address?132 133 134 135 136 How does a bridge function? 138 What are two purposes for using switches? Choose two What is an example of a valid MAC address? 141 Which two physical interfaces does PPP support? Choose two Answers C, D143 144 145 146 147 148 149 What is the purpose of ISL and 802.lq frame tagging? 151 152 Which of the following describes isdn bri servie? 154 Answer B What do you use for loop avoidance? Choose two 156 Answer B Diagram 158 Answer A, B, E Identify the effect of Ctrl-Z? 160 161 162 163 Answer a How do you change the Console password to cisco? 165 166 167 Answer D Q299 Answer C 301Answer a 304 Answer D 302Answer C 303 Answer B, C 307 Answer D 309 What is the purpose of DLCIs in Frame Relay? Answer B 310172 173 Answer C 318 175 176 177 178 179 180 Q327 Answer Unknown 328 Answer Unknown

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