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92 Cards in this Set
- Front
- Back
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What are the two trunking protocols supported by Cisco switches? |
802.1q and ISL.
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How do you change the setting of the configuration register?
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config–register
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You configure a serial connection with PPP. When you enter: show int fa 0/0 you see the interface is up/up and LCP is open but you can't communicate. What is the problem?
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Incorrect IP or Subnet
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How do you debug PPP authentication?
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#debug ppp authentication
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How can you verify the status of PPP athentication
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show int s 0/0 and then view if LCP is open (Working) or closed (failed)
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Why do you use PPP?
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To communicate on point to point links between non Cisco devices
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What are the possible RSTP states?
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"Discarding, Learning, Forwarding"
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What are the possible STP states?
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"Disabled, Blocking, Listening, Learning, Forwarding"
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What does (config)# line con 0 allow you to do?
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"Change the setting on the console such as MOTD banner, password and username"
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How many bytes in an IPv6 Address?
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16 bytes
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How many bits in an IPv6 Address?
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128
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How many bits in an IPv4 Address?
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32
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Can the following hosts talk to eachother without a router? 192.168.10.17 /28 –––––– 192.168.10.32 /28
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No
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How many hosts are on a /24 Network? What is it's subnet mask? What is it's wildcard mask?
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255.255.255.0 //// 2^8 – 2 = 254 // 0.0.0.255
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How many hosts are on a /25 Network? What is it's subnet mask? What is it's wildcard mask?
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255.255.255.128 //// 2^7 – 2 = 126 // 0.0.0.127
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How many hosts are on a /26 Network? What is it's subnet mask? What is it's wildcard mask?
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255.255.255.192 //// 2^6 – 2 = 62 // 0.0.0.63
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How many hosts are on a /27 Network? What is it's subnet mask? What is it's wildcard mask?
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255.255.255.224 //// 2^5 – 2 = 30 // 0.0.0.31
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How many hosts are on a /28 Network? What is it's subnet mask? What is it's wildcard mask?
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255.255.255.240 //// 2^4 – 2 = 14 // 0.0.0.15
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How many hosts are on a /29 Network? What is it's subnet mask? What is it's wildcard mask?
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255.255.255.248 //// 2^3 – 2 = 6 // 0.0.0.7
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How many hosts are on a /30 Network? What is it's subnet mask? What is it's wildcard mask?
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255.255.255.252 //// 2^2 – 2 = 2 // 0.0.0.3
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What port is FTP?
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21
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What port is SMTP?
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25
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What port is DNS?
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53
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How do you stop DNS lookup on a router?
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(config)#: no ip domain–lookup
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How to you set multiple ports at one time?
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(config)#: int range fa 0/1–4
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What is the loopback address?
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127.0.0.1
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What ports is DHCP
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Ports 67 and 68
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What is a Class A IP Address?
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1–126
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What is a Class B IP Address?
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128–191
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What is a Class C IP Address?
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192–223
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What is a Class A Private IP Address?
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10.0.0.0 – 10.255.255.255
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What is a Class B Private IP Address?
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172.16.0.0 – 172.31.255.255
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What is a Class C Private IP Address?
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192.168.0.0 – 192.168.255.255
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What is RIP's administrative distance?
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120
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What algortihm does RIP use?
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Bellman Ford (Distance Vector)
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What algortihm does EIGRP use?
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Dual
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What algortihm does OSPF use?
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Dijkstra
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What algortihm does BGP use?
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Dijkstra
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What algortihm does IS–IS use?
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Path Selection
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What is EIGRP Administrative Distance?
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90 (External) / 170 (External)
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What is OSPF Administrative Distance?
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110
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What is IS–IS Administrative Distance?
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115
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What is BGPs Administrative Distance?
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20 / 200 (IBGP)
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"The following is a partial output of the show interfaces command: ""Serial 0 is up, line protocol is down"" What does this signify?"
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The physical connection is working but there's a problem with the configuration or the interface is shutdown
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How do you troubleshoot a startup problem on a switch? What does post stand for?
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Show post /// Power on self test
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How do you view realtime updates of RIP?
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debug ip rip
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How often does RIP send routing updates?
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30 seconds
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How do you set PPP encapsulation on a router?
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encapsulation PPP
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How do you copy an IOS image config from one router to another
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copy tftp flash
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Why would you select PPP over HDLC for a WAN network?
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HDLC is Cisco specific while PPP can be used between vendors
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How do you set the enabled password?
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enable privilaged password (password)
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How do you configure the enable password for the rotuer ?
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enable password (password)
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How do you configure which commands are accessible at various levels?
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privilege level
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What are the five network topologies?
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"Bus, Ring, Star, Mesh, Hybrid"
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What are the there major categories of WAN technologies?
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"Circuit Switched, Packet (Or cell) switched, Point to Point (Directed)"
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What WAN technologies use circuit switched?
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ISDN
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What are the advantages of circuit switched?
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"Cost (Cheaper), Scalability (Easy to install and expand), availability"
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How do packet switched tecnologies work? What are the advantages?
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"After each message is sent, the circuit is cleared. This allows multiple connections through one device"
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Which OSI layer is concered with reliable end–to–end delivery of data?
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Transport
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Which is connectionless? TCP or UDP?
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UDP
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At which layer of the OSI model would you find framing?
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Data link
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Which layer of the TCP/IP stack is routing and logical addressing found?
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Internet
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Which layer of the TCP/IP stack is framing found?
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Network
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What TCP transport layer protocol provides IP address resolution for domain names?
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DNS
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What are the steps in a 3 way hand shake?
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"SYN, SYN/ACK, ACK"
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What is the CIR?
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Commited Information rate – minimum bandwidth guaranteed by the provider
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What does TTL do?
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Time to live – prevents routing loops by creating a number of hops till end
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What HDLC field is specific to Cisco?
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Type field
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What layer 4 features is used for reliability?
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"The process of numbering, acknowleding each packet"
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A protocol that requires an exchange of messages before data transfer begins ?
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Connection oriented
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The switch fully receives all bits in the frame before forwarding the frame. This allows the switch to check the FCS before forwarding the frame
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Store and Forward Switching
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The switch forwards the frame as soon as it can. This reduces latency but does not allow the switch to discard frames that fail the FCS check.
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Cut–through switching method
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"The switch forwards the frame after receiving the first 64 bytes of the frame, thereby avoiding forwarding frames that were errored due to a collision"
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Fragment–free switching method
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"Cisco uses three terms to describe the role of each switch, what are they?"
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"Core, Distrubtion, Access"
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What are the default settings on a console port?
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* 9600 bits/second* No hardware flow control* 8–bit ASCII* No stop bits* 1 parity bit
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What are the four major types of memory on a Cisco switch?
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"RAM, ROM, NVRAM, Flash"
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What is stored in RAM?
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Running config
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What is stored in ROM?
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Stores a bootstrap program that is loaded when the switch powers on and finds the full Cisco IOS image and manages loading the IOS into RAM
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What is stored in Flash?
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Cisco IOS images
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How do you configure SSH on a switch
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"All of these are required: hostname, ip domain–name, RSA key, username and password"
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What are the message banners you can change?
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"MOTD, login, exec"
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How do you determine the DCE end of a connection?
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show controllers
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"What routing protocols use the interface bandwidth settings to set their default metrics, with the metrics impacting a router's choice of the best IP route to reach each subnet?"
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OSPF and EIGRP
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How do you copy an IOS image into flash?
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"Step 1 – Obtain IOS image from Cisco, by downloading the IOS image from Cisco.com using HTTP or FTP. Step 2 – Place IOS image into the default directory of a TFTP server that is accessible from the router. Step 3 – Issue the copy command from the router, copying the file into Flash memory. ––> R1#copy tftp flash"
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How do you show the current value of the register?
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show version
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To enter the ROM monitor set the configuration register value to?
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0x2100
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What metric does RIP use?
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Hop count
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What metric does EIGRP use?
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"Bandwidth, Load and delay"
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What is the multicast address for RIPv2 addresses?
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224.0.0.9
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"This command lists information about the RIP configuration, plus the IP addresses of neighboring RIP routers from which the local router has learned routes."
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show ip protocols
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What is the administrative distance of EIGRP?
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90
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What is the administrative distance of OSPF?
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110 |
