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137 Cards in this Set
- Front
- Back
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What type of ICMP message is generated when a router faces congestion at any of its interfaces?
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source quench message
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What are the three modes possible for VTP (VLAN trunking protocol)?
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client, server, and transparent
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Which routing metric enables a router to make a decision based on the extent to which a link is busy?
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load
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What type of authentication and encryption does WPA personal use?
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PSK for authentication, TKIP for encryption
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What is the default CDP hold down time?
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180 seconds
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Which service set type is created when wireless clients are connected to each other without using an access point?
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IBSS (independent basic service set)
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How many non-overlapping channels are available in the 5GHz frequency spectrum?
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12
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What is the range of private addresses for class b?
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172.16.0.0 - 172.31.255.255
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Which Cisco IOS command is used to view VLAN and instance mapping information?
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show spantree mapping
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What is the maximum transmission speed offered by an ATM WAN link?
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155 Mbps
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Which command will enable you to use hostname with the ping and traceroute command in place of IP addresses on a Cisco router?
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ip domain-lookup
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Which TCP port is used by the ICMP ehco command?
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TCP port 7
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What is the term for the TCP error recovery and windowing process?
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Positive Acknowledgement Retransmission (PAR)
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Which command is used to set time for CDP updates?
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cdp timer
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What is the default time a port takes to transit from blocking through forwarding during normal operations of STP?
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50 seconds
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Which Cisco IOS command will enable the interface to acquire an IP address from a DHCP server?
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ip address dhcp
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What are the four types of NAT?
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static, dynamic, overloading, overlapping
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What are the three configuration modes for the switchport port-security violation command?
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shutdown, restrict, protect
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What is the private IP address range for class a?
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10.0.0.0 - 10.255.255.255
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What is the size of the acknowledgement field in the TCP packet header?
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32bits
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What Cisco command is used to clear the table that contains CDP information about neighboring devices?
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clear cdp table
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What enhancement of CDP allows it to carry VLSM information?
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on-demand routing
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Which Cisco IOS command is used to re-enable DHCP server and DHCP relay agent service on a Cisco router if the services have been disabled?
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service dhcp
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What is the private IP address range for class c?
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192.168.0.0 - 192.168.255.255
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What interface command is used to enable the DHCP relay agent on the specified router interface?
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ip helper-address
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What are the four types of DHCP packets sent out (listed in the order they are sent) from a host to a DHCP server?
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DHCPDISCOVER
DHCPOFFER DHCPREQUEST DHCPACKNOWLEDGEMENT Pneumonic: (DORA) |
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What command replaces the IOS image with an image from a TFTP server?
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copy tftp flash
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How many non-overlapping channels are in the 2.4GHz frequency band?
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three
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What are two types of delay that are also characteristics of real-time traffic?
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Fixed and variable delay
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Give examples of the following:
Circuit-switched WAN Packet-switched WAN Cell-switched WAN |
Circuit-switched: PSTN
Packet-switched: Cable, DSL, or Frame Relay Cell-switched: ATM |
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What is the default administrative distance of EIGRP?
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90
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What Cisco IOS command would you use to determine the type of cable connected to a serial interface?
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show controller
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What command is used to backup the current IOS image on a cisco router?
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copy flash tftp
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What command is used to make a backup copy of configuration in RAM?
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copy running-config tftp
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Where is the Cisco security device manager stored?
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Flash memory
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What does a switch do when it receives a frame from a host to a host on the same subnet/network?
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It "filters" the frame (a.k.a drops it)
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What encapsulation method must a physical medium support for CDP to operate on a network?
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SNAP
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What command is used to make the configuration in RAM the configuration the router will use on startup?
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copy running-config startup-config
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What command is used to merge a backup configuration with the configuration in RAM?
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copy tftp running-config
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What are the three possible VLAN trunking modes?
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auto, on, and desirable
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What does the command "debug ip rip" do?
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It tells the router to generate log messages each time the router sends or receives a RIP update
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Where is the initial startup-config file stored?
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NVRam (non-volatile ram)
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Where are running(active) configuration files stored at on a Cisco router?
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RAM
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Which command disables CDP on the device as a whole?
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no cdp run
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What is the default configuration-register value on a Cisco router if the router is going to boot normally to the IOS?
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0x2102
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What does ATM forward?
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53-Byte Cells
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What is the media type and maximum segment length for 1000Base-LX (multimode)?
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550M for 50 and 62.5 micron fiber
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Which command sets the console session timeout to 15minutes and 30seconds?
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exec-timeout 15 30
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What does it mean if your configuration has the no ip subnet-zero command?
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The first subnet and last subnet are completely unusable, but all addresses in any other subnets are useable
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Where are IOS images stored on a Cisco router?
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Flash memory
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Protocol: FTP Data and FTP control
What is the port number? TCP/UDP? |
FTP Control = Port 21, TCP
FTP Data = Port 20, TCP |
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Which command is used to return to user EXEC mode from the priviledged EXEC mode?
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disable
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Which command enables a telnet session to receive console messages?
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terminal monitor
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Which command adds a time stamp to a debug or log message?
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service timestamps
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You have finished physically installing an access point on the ceiling at a newly opened office. At a minimum, which parameter must you configure on the access point in order to allow wireless clients to operate on it?
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SSID
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Which bits in the configuration register value make up the boot field?
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The lowest four bits
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Which commands in CDP display the device platform of a directly connected device?
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show cdp entry * and show cdp neighbors detail
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Which Cisco router component is used primarily to store the start-up configuration file?
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NVRAM
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Define DCE (data communications equipment)
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Typically the CSU/DSU is the DCE and it provides the clocking rate on a WAN link to the DTE. The service provider's switch is an example of DCE.
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Define synchronous
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A device uses the same speed as another device on the end of the serial link
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Define DTE (data terminal equipment)
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Synchronizes its clock based on the DCE. Device outside the ISP's network (e.g. the company's router)
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What command is necessary to save configuration changes on a Cisco router?
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copy running-config startup-config
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How many simultaneous telnet sessions does a Cisco router support by default?
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Five
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What does the command CDP enable do?
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Enables CDP on a specific interface
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What is the maximum segment length and media type for 1000Base-SX?
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Multimode fiber
275m for 62.5 micron fiber 550m for 50 micron fiber |
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True or False: CDP discovers only directly connected devices
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True
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What does the configuration-register 0x2100 do?
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Causes the router to load the ROMMON operating system instead of the IOS (used for recovering passwords)
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Where does the Ethernet FCS (frame check sequence) field reside?
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Ethernet trailer
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What layer do WAPs operate at?
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OSI Layer 2
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List the distance vector routing protocols
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RIP, RIPv2, IGRP
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List the link-state routing protocols
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OSPF, IS-IS
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List the hybrid routing protocols
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EIGRP
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What timeframe does RIP send updates?
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Every 30 seconds
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What is RIPs default administrative distance?
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120
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Where is bootstrap stored at on a Cisco router?
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ROM
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Three access points have been installed and configured to cover a small remote office. What term defines the wireless topology?
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ESS (enterprise service set)
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List the configuration steps for configuring a VLAN
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router#(conf) interface vlan 1
router#(conf-int) ip address x.x.x.x x.x.x.x router#(conf-int) no shut router#(conf) ip default-gateway |
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The source port in both a UDP header and a TCP header is called what?
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16-bit number of the calling port
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What layer of the OSI model does CDP operate at?
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data link
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Which spread spectrum technology does the 802.1b standard define for operation?
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Direct Sequence Spread Spectrum (DSSS)
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Which IEEE standard is used to define Wi-Fi?
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IEEE 802.11
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Do VLANs create broadcast domains or collision domains?
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Broadcast domains (don't forget this.)
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What devices transmit on pins 3 and 6 and receive on pins 1 and 2?
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Hubs and switches
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Which command clears a specific extended dynamic translation entry from the NAT translation table?
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clear ip nat translation inside
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What is the default value of the RIP hold down timer?
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180 seconds
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What pairs connect on a crossover cable?
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1 - 3
2 - 6 3 - 1 6 - 2 |
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What type of cable is used when connecting a switch to another switch?
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Crossover cable
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What are the four steps of the router boot process?
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1) POST
2) Bootstrap is copied from ROm to RAM and then ran 3) Bootstrap decides which IOS image to load into RAM and then loads it and hands control over to the IOS 4) IOS finds the configuration file in NVRAM and loads it into RAM as the running-configuration |
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Which CDP command displays packet checksum errors?
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show cdp traffic
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What type of cable is used when connecting a switch to a hub?
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Crossover cable
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What is the size of the control fields in the TCP header?
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6 bits
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What is the media type and maximum segment length for 100Base-FX?
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62.5 and 125 micron multimode fiber
400m |
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List the configuration steps for configuring SSH
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line vty 0 15
--> login local --> transport input telnet ssh exit username xxx password xxx ip domain-name example.com crypto key generate rsa |
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What type of cable is used when connecting a switch to a router?
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Straight-through cable
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How many useable host ip addresses are there in a class B network?
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65,534
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What encryption does WPA2 use?
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AES-CCMP
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What are three basic parameters to configure an AP?
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Authentication method, RF channel, SSID
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What are the TCP/IP architecture layers?
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ATIN
Application Transport Internet Network |
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Where does HTTP, POP3, and SMTP occur at in the TCP/IP model?
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Application
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List the three types of wireless encoding and what standards use which type
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FHSS
DSSS (802.11b) OFDM (802.11a, 802.11g) |
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What is the media type and maximum segment length for 1000Base-T?
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Cat5 UTP (uses four pairs)
100m |
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Where does ethernet, frame relay, and PPP occur at in the TCP/IP model?
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Network
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Define spanning-tree-protocol
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Prevents switching loops by using spanning tree algorithm
Switches exchange BPDUs (bridge protocol data units) messages with other bridges to detect loops and then remove the loops by shutting down selected bridge interfaces |
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To add an interface to a VLAN what commands are necessary?
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interface "interface name"
switchport mode access vlan "vlan ID" switchport mode access |
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Where does IP occur at in the TCP/IP model?
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Internet
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The output of which command displays the active translations for a NAT translation table?
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show ip nat translations
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What is the subnetwork number of a host with an IP address of 172.16.66.0/21?
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172.16.64.0
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protocol: HTTP
port #? tcp/udp? |
80
tcp |
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protocol: TFTP
port #? tcp/udp? |
69
UDP |
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What is the media type and max segment length for 1000Base-LX (single mode)?
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9 micron single mode fiber
5 km |
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What is the media type and max segment length for 1000Base-CX?
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STP
25m |
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What devices transmit on pins 1 and 2 and receive on pins 3 and 6?
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PC NICs
Routers WAP Networked Printers |
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What type of cable is required to connect a PC NIC to a router?
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Crossover
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What type of cable is required to connect a WAP to a router?
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Crossover
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What type of cable is required to connect a PC to the console port on a router?
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Rollover
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Which OSI layer handles standards for data formats and encryption?
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Presentation
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What is the maximum number of characters for a wireless SSID?
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32
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Protocol: DHCP
Port #? TCP/UDP? |
67, 68
UDP |
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Protocol: SSL
Port #? TCP/UDP? |
443
TCP |
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Protocol: SNMP
Port #? TCP/UDP? |
161
UDP |
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Protocol: POP3
Port #? TCP/UDP? |
110
TCP |
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Protocol: SSH
Port #? TCP/UDP? |
22
TCP |
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Protocol: Telnet
Port #? TCP/UDP? |
23
TCP |
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Protocol: SMTP
Port #? TCP/UDP? |
25
TCP |
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Protocol: DNS
Port #? TCP/UDP? |
53
UDP OR TCP |
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Which CLI prompt indicates you are working in priviledged EXEC mode?
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hostname#
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Where is the running configuration stored at on a Cisco router?
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RAM
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What standard does 802.11g use?
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OFDM
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What is the command to enable a DNS server?
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ip name-server
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What is the media type and maximum segment length for 100Base-TX?
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Cat5 UDP
100m |
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Which command displays the frequency at which packets are sent (in relation to CDP?)
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show cdp interface
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What is the maximum transmission speed of 802.11g?
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54mbps
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What is the maximum transmission speed of 802.11b?
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11mbps
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What is the maximum transmission speed of 802.11a?
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54mbps
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What frequency band does 802.11g use?
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2.4GHz
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What frequency band does 802.11a use?
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5GHz
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What frequency band does 802.11b use?
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5GHz
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