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34 Cards in this Set
- Front
- Back
- 3rd side (hint)
What are the five main components that are required to make progress with high availability?
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Redundancy, Technology, People, Processes, and Tools
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All five of these components must be individually implemented for a high-availability solution to succeed.
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What is the typical failover time for a tuned OSPF or EIGRP network?
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Under 1 second
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A well-designed OSPF or EIGRP network can have a failover time of less than 1 second.
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What is the typical failover time for an Etherchannel link?
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Under 1 second
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When a failure occurs on one of the Etherchannel links, traffic will be automatically transferred to the working links, typically in less than 1 second.
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What is the recommended link configuration between the core and distribution layers?
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Full mesh
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It is recommended that distribution switches be full meshed with all core devices.
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What is the recommended link configuration between the Distribution and Access layers?
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Redundant links
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Each Access layer device should have at least one redundant link to a second Distribution layer device.
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What Cisco high-availability technology synchronizes the startup configuration, startup variables, running configuration, and other runtime data with the standby route processor?
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Stateful Switchover (SSO)
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The SSO feature allows the redundant route processor to provide a smoother switchover from a failing active route processor. When using this feature, there is very little layer 2 traffic interruption.
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What Cisco high-availability technology works with BGP, EIGRP, OSPF, and IS-IS to continue to forward packets during a route processor failover?
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NonStop Forwarding (NSF)
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These routing protocols are NSF aware and are able to detect route processor failure and take action to ensure continued traffic forwarding.
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What two types of NSF devices exist?
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NSF-capable and NSF-aware devices
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NSF not only requires that a device support the NSF capabilities, but also requires that the devices neighbors be NSF aware.
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What Cisco switching devices are NSF-capable?
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3750, 4500, and 6500 Series
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As of this writing, the 3750, 4500, and 6500 series switches have some NSF-capability.
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What are the parameters that are synchronized when using SSO?
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Startup and running configurations, startup variables, layer 2 and 3 protocol tables, and state information
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SSO allows for a quick supervisor switchover at layers 2 through 4. This is done by synchronizing the startup and running configuration information, startup variables, and layer 2 and 3 protocol tables and state information, which includes routing tables, MAC tables, and QoS and ACL information.
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What version(s) of IP is supported by NSF with SSO?
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IPv4 only
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As of this writing, NSF with SSO is only supported with IPv4 traffic and protocols.
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What Cisco IOS command would be used to enter redundancy configuration mode?
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switch(config)#redundancy
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In order to configure SSO, you must be in redundancy configuration mode.
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What Cisco IOS command enables the SSO redundancy feature on the switch?
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switch(config-red)#mode sso
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Issuing this command puts the supervisor engines into SSO mode.
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Which Cisco IOS command enables NSF with OSPF and EIGRP?
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switch(config-router)#nsf
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The nsf command is used to enable OSPF and EIGRP into NSF mode.
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What Cisco IOS command can be used to display the status of SSO and NSF with CEF?
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switch#show cef state
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This command displays the route processors' state, as well as the state of SSO and NSF on the processor.
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What Cisco IOS command is used to display the status of NSF with OSPF?
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switch#show ip ospf
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This command displays the status of NSF within OSPF and displays a timer of when the last NSF restart occurred.
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What Cisco IOS command is used to display the status of NSF with EIGRP?
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switch#show ip protocols
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This command displays the status of NSF with EIGRP and associated configured timers.
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What Cisco feature provides message and error reporting?
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syslog
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Syslog is a very common service that also runs on Cisco equipment and supplies both messaging and error reporting services.
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What are the available syslog severity levels?
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0 through 7
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Syslog has eight severity levels, which are ranked from emergency level 0 through debugging level 7.
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What are the four main sections of the Cisco syslog message standard?
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Facility, Severity, Mnemonic, and Message-Text
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A Cisco device logs a syslog message with these four components.
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Which of the Cisco syslog message standard components consists of two or more uppercase letters, which indicate the hardware device, protocol or module?
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Facility
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There are a number of different facility codes that are used on Cisco devices; some common ones include SYS and LINK.
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Which of the Cisco syslog message standard components consists of a single numeric digit that reflects the level of the message?
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Severity
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The severity field shows the specific syslog level that has been associated with a message. The message levels range from 0 (emergency) through 7 (debugging).
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Which of the Cisco syslog message standard components consists of a code that uniquely identifies the error message?
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Mnemonic
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The mnemonic field is simply an abbreviated code that identifies the message.
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What protocol is typically used as the foundation of network management?
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SNMP
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The Simple Network Management Protocol (SNMP) is typically used as a foundation for network management.
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What Transport layer protocol is used by SNMP?
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UDP
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SNMP uses UDP ports 161 and 162.
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What SNMP component contains a database of objects?
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Management Information Base (MIB)
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An MIB is a database of SNMP object information and can be used to store a number of different types of information (for example, interface status and statistical information).
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What SNMP components polls agents on the network and compiles and displays data?
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SNMP manager
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The SNMP manager has the duty of both polling network agents and also compiling this information into a useful display for network administrators/engineers.
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What type of SNMP notification is initiated by a device when certain events occur?
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Trap
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A network device can be configured to generate traps when different events occur, such as a link going up/down or supervisor switchovers.
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What are the five basic SNMP messages that are used to transfer data between a manager and an agent?
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Get Request, Get Next Request, Set Request, Get Response, and Trap
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These five different messages are used by SNMP to transfer a variety of different types of information to and from an agent (which typically resides on a network device).
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What are the two new message types that were introduced with SNMP v2?
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Get Bulk Request and Inform Request
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The Get Bulk Request provides additional efficiency over SNMPv1 as it eliminates repetitive requests. The Inform Request allows a confirmed message between the manager and the agent.
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What are the three levels of security provided by SNMPv3?
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noAuthNoPriv, authNoPriv, and authPriv
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noAuthNoPriv does not provide authentication or encryption, autoNoPriv provides authentication but no encryption, and authPriv provides both authentication and encryption.
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What Cisco IOS command sets the SNMP community string?
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switch(config)#snmp-server community string ro|rw
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This command is used when configuring SNMP to specify the community string, which is required to communicate with the device.
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What are the most common benefits of implementing IP SLA?
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Service-Level monitoring, measurement, and verificationNetwork performance monitoringEdge-to-Edge network availability monitoringIP Service network health assessment
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These are just a few of the reasons to implement IP SLA.
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What performance metrics are able to be monitored using IP SLA?
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Delay, Jitter, Packet Loss, Path Sequencing, Path, Connectivity, and Server down time.
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These different metrics are able to be monitored through configuration of IP SLA.
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