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WorksheetsMod 9-11
Total questions: 101
Worksheet time: 52mins
What is the variable amount of time it takes for a frame to traverse the links between the source and destination?
Serialization delay
Propagation delay
Code delay
What happens when congestion occurs?
Packet loss
Jitter
Code delay
What is the fixed amount of time it takes to transmit a frame from the NIC to the wire?
Serialization delay
Jitter
Code delay
What is caused by variation in delay?
Congestion
Packet loss
Jitter
Which type of traffic tends to consume a large portion of network capacity?
Voice
Video
Data
Which type of traffic requires at least 384 Kbs of bandwidth?
Voice
Video
Data
Which type of traffic is unpredictable, inconsistent, and bursty?
Voice
Video
Data
Which type of traffic can be predictable and smooth?
Voice
Video
Data
Which type of traffic cannot be retransmitted if lost?
Voice
Video
Data
Which type of traffic must receive a higher UDP priority?
Voice
Video
Data
Which queuing algorithm simultaneously schedules interactive traffic to the front of a queue to reduce response time?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm provides support for user-defined traffic classes?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm is effective for large links that have little delay and minimal congestion?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm classifies traffic into different flows based on packet header addressing?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm allows delay-sensitive data such as voice to be sent before packets in other queues?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm applies priority, or weights, to identify traffic and classify it?
FIFO
WFQ
CBWFQ
LLQ
Which QoS model provides per-request policy admission control?
Best Effort
Integrated services
Differential services
Which QoS model requires no special QoS mechanisms?
Best effort
Integrated services
Differential services
Which QoS model provides many different levels of quality?
Best effort
Integrated services
Differential services
Which QoS model uses explicit end-to-end resource admission control?
Best effort
Integrated services
Differential services
Which QoS model is the most scalable?
Best effort
Integrated services
Differential service
Which detects when traffic rates reach a configured maximum rate and drops excess traffic?
Traffic policing
Traffic shaping
Classification
Which determines what class of traffic packets or frames belong to.
Marking
Classification
Traffic shaping
Which adds a value to the packet header?
Marking
Classification
802.1Q
Which provides buffer management and allows TCP traffic to throttle back before buffers are exhausted?
Traffic policing
802.1Q
WRED
Which retains excess packets in a queue and then schedules the excess for later transmission over increments of time?
WRED
Traffic policing
Traffic shaping
What is the term used to indicate a variation of delay?
Latency
Speed mismatch
Serialization delay
Jitter
A network engineer performs a ping test and receives a value that shows the time it takes for a packet to travel from a source to a destination device and return. Which term describes the value?
Bandwidth
Latency
Priority
Jitter
What role do network devices play in the IntServ QoS model?
Network devices provide a best-effort approach to forwarding traffic
Network devices ensure that resources are available before traffic is allowed to be sent by a host through the network
Network devices are configured to service multiple classes of traffic and handle traffic as it may arrive
Network devices use QoS on a hop-by-hop basis to provide excellent scalability
Which device would be classified as a trusted endpoint?
Switch
Firewall
Router
IP phone
Under which condition does congestion occur on a converged network with voice, video, and data traffic?
If video traffic requests more bandwidth than voice traffic requests
If a user downloads a file that exceeds the file limitation that is set on the server
If the request for bandwidth exceeds the amount of bandwidth available
If voice traffic latency begins to decrease across the network
Which type of traffic does Cisco recommend be placed in the strict priority queue (PQ) when low latency queuing (LLQ) is being used?
Management
Voice
Data
Video
Which model is the only QoS model with no mechanism to classify packets?
IntServ
DiffServ
hard QoS
Best-effort
What happens when the memory queue of a device fills up and new network traffic is received?
The network device sends the received traffic immediately
The network device drops all traffic in the queue
The network device will drop the arriving packets
The network device queues the received traffic while sending previously received traffic
What are two characteristics of voice traffic? (Choose two.)
It is sensitive to packet loss
It is bursty
it can tolerate latency up to 400 ms
It consumes few network resources
It is delay sensitive
Which QoS model is very resource intensive and provides the highest guarantee of QoS?
Soft QoS
IntServ
DiffServ
Best-effort
What happens when an edge router using IntServ QoS determines that the data pathway cannot support the level of QoS requested?
Data is forwarded along the pathway using best-effort approach
Data is forward along the pathway using DiffServ
Data is forwarded along the pathway using IntServ but not provided preferential treatment
Data is not forwarded along the pathway
In QoS models, which type of traffic is commonly provided the most preferential treatment over all other application traffic?
Voice traffic
File transfers
Web traffic
Which queuing mechanism supports user-defined traffic classes?
CBWFQ
FIFO
FCFS
WFQ
What mechanism compensates for jitter in an audio stream by buffering packets and then replaying them outbound in a steady stream?
Playout delay buffer
WFQ
Voice codec
Digital signal processor
Which protocol is used to gather information about Cisco devices which share the same data link?
CDP
LLDP
Which protocol works with network devices, such as routers, switches, and wireless LAN access points across multiple manufacturers’ devices?
CDP
LLDP
Which SNMP version authenticates the source of management messages?
Version 2
Version 3
Both
Which SNMP version provides services for security models?
Version 2
Version 3
Both
Which SNMP version does not provide encrypted management messages?
Version 2
Version 3
Both
Which SNMP version is supported by Cisco IOS software?
Version 2
Version 3
Both
Which SNMP version includes expanded error codes with types?
Version 2
Version 3
Both
Which SNMP version uses community-based forms of security?
Version 2
Version 3
Both
Which SNMP version is used for interoperability and includes message integrity reporting?
Version 2
Version 3
Both
*Jun 12 17:46:01.619: %IFMGR-7-NO_IFINDEX_FILE: Unable to open
nvram:/ifIndex-table No such file or directory
Refer to the syslog output. What security level generated the message?
Error
Informational
Warning
Debugging
*Jun 12 17:46:01.619: %IFMGR-7-NO_IFINDEX_FILE: Unable to open
nvram:/ifIndex-table No such file or directory
Refer to the syslog output. What is the mnemonic for this syslog message?
IFMGR
Unable to open nvram
NO_IFINDEX_FILE
IfIndex-table
*Jun 12 17:46:01.619: %IFMGR-7-NO_IFINDEX_FILE: Unable to open
nvram:/ifIndex-table No such file or directory
Refer to the syslog output. What is the syslog reporting facility?
IFMGR
NO_IFINDEX_FILE
IFMGR-7
IfIndex-table
What are two reasons for an administrator to issue the copy running-config tftp command on a switch or router? (Choose two.)
To save the running configuration file to a remote location
To force an automatic reload of the device
To overwrite the current configuration
To have a backup of the running configuration file in the router
To transfer the current configuration file to a server
What information can be gathered about a neighbor device from the show cdp neighbors detail command that cannot be found with the show cdp neighbors command?
The capabilities of the neighbors
The IP address of the neighbor
The platform that is used by the neighbor
The hostname of the neighbor
When SNMPv1 or SNMPv2 is being used, which feature provides secure access to MIB objects?
Source validation
Message integrity
Community strings
Packet encryption
What command must be issued on a Cisco router that will serve as an authoritative NTP server?
Ntp master 1
Ntp server 172.16.0.1
Clock set 11:00:00 DEC 20 2010
Ntp broadcast client
Which protocol or service can be configured to send unsolicited messages to alert the network administrator about a network event such as an extremely high CPU utilization on a router?
Netflow
NTP
Syslog
SNMP
Which statement describes a syslog message severity level?
Severity level 0 is the most critical severity level
A syslog alarm with a severity level of 7 indicates an emergency situation that can render the system unusable
A severity level 7 message is only accessible through the terminal line
A syslog alarm at the severity level 4 and higher is sent to an external syslog server by default
What is an SNMP management agent?
A computer loaded with management software and used by an administrator to monitor a network
A database that a device keeps about network performance
Software that is installed on devices managed by SNMP
A communication protocol that is used by SNMP
What are two characteristics of SNMP community strings? (Choose two.)
SNMP read-only community strings can be used to get information from an SNMP-enabled device
Commonly known community strings should be used when configured secure SNMP
If the manager sends one of the correct read-only community strings, it can get information and set information in an agent
SNMP read-write community strings can be used to set information on an SNMP-enabled device
A vulnerability of SNMPv1, SNMPv2, and SNMPv3 is that they send the community strings in plaintext
A network administrator issues the copy tftp running-config command on a router. What is the administrator trying to achieve?
Copy the configuration file from the NVRAM of the router to the TFTP server
Copy the configuration file from the TFTP server to the RAM of the router
Copy the configuration file from the TFTP server to the NVRAM of the router
Copy the configuration file the RAM of the router to the TFTP server
What is a characteristic of the MIB?
Information in the MIB cannot be changed
The OIDs are organized in a hierarchical structure
A separate MIB tree exists for any given device in the network
Information is organized in a flat manner so that SNMP can access it quickly
What data would be saved and where would the data be placed if a network administrator issued the following command? (Choose two.)
The data will be saved in NVRAM
The data will be saved in RAM
The data to be saved is the configuration that is being modified in RAM
The data to be saved is the configuration that is stored in NVRAM
The data will be saved to a TFTP server
Which command would a network engineer use to restore the IOS image c1900-universalk9-mz.SPA.152-4.M3.bin to a router?
copy flash0: tftp:
copy tftp: flash0:
copy flash0: c1900-universalk9-mz.SPA.152-4.M3.bin
copy c1900-universalk9-mz.SPA.152-4.M3.bin tftp:
Why would a network administrator issue the show cdp neigbors command on a router?
To display device ID and other information about directly connected cisco devices
To display routing table and other information about directly connected cisco devices
To display line status and other information about directly connected cisco devices
To display router ID and other information about OSPF neighbors
What are SNMP trap messages?
Messages that are sent periodically by the NMS to the SNMP agents that reside on managed devices to query the device for data
Messages that are used by the NMS to query the device for data
Unsolicited messages that are sent by the SNMP agent and alert the NMS to a condition on the network
Messages that are used by the NMS to change configuration variables in the agent device
Which term is used to describe a network that is always accessible?
Hierarchical
Modular
Resilient
Flexible
Which characteristic of a network allows it to expand and provide on-demand services?
Hierarchical
Modular
Resilient
Flexible
Which term describes the ability of a network to use all available network resources and to provide data load sharing?
Hierarchical
Modular
Resilient
Flexible
Which network layer provides fault isolation and high-speed backbone switch connectivity?
Core
Distribution
Access
Which network layer provides direct, switched network connectivity to the user?
Core
Distribution
Access
Which network layer integrates with the backbone and users to provide intelligent switching, routing, and security?
Core
Distribution
Access
Which three recommendations may be included in a network design strategy that is focused on scalability? (Choose three.)
Design a hierarchical network
Use layer 2 devices to filter and reduce network traffic in the core
Choose routers or multilayer switches to limit broadcasts and filter other undesirable traffic from the network
Use expandable, modular equipment, or clustered devices that can be easily upgraded to increase capabilities
Combine the access the distribution layer for easier access and limit the size of the failure domain
True or false? OSPF is well-suited for larger networks because it can be deployed using a hierarchical design.
True
False
What are three important features that should be considered for implementation in a well-designed, scalable network? (Choose three.)
Static routes
Redundant links
Multiple links
Access layer with only wired devices
Expandable, modular equipment
Which category of switch is used to aggregate traffic at the edge of the network?
Campus LAN switches
Cloud-managed switches
Service provider switches
Data center switches
Field replaceable line cards are a feature found on which type of switch?
Modular
Fixed configuration
Virtual
Stackable
This is the term used to describe switches that can be interconnected and managed as one larger single switch.
Modular
Stackable
Cloud-managed
Multilayer
This is the term used to describe the number of ports available on a single switch.
Speed
Scalability
Density
Modularity
This is the term used to describe how much data a switch can process per second.
Forwarding rate
Power
Reliability
Wire speed
Which type of switch supports routing protocols and can forward IP packets at close to Layer 2 forwarding rates?
Modular
Stackable
Cloud-managed
Multilayer
This type of router provides fast performance with high security for data centers, campus, and branch networks.
Branch routers
Network edge routers
Service provider routers
Industrial routers
This type of router provides end-to-end delivery of subscriber services.
Branch routers
Network edge routers
Service provider routers
Industrial routers
This type of router provides simple network configuration and management for LANs and WANs.
Branch routers
Network edge routers
Service provider routers
Industrial routers
This type of router is designed to provide enterprise-class features in rugged and harsh environments.
Branch routers
Network edge routers
Service provider routers
Industrial routers
This type of router delivers next-generation internet experience across all devices and locations.
Branch routers
Network edge routers
Service provider routers
Industrial routers
Which cost-effective physical network topology design is recommended when building a three-tier campus network that connects three buildings?
Extended star
Dual ring
Bus
Mesh
How much traffic is a 48-port gigabit switch capable of switching when operating at full wire speed?
1 Gb/s, because data can only be forwarded from one port at a time
48 Gb/s, by providing full bandwidth to each port
44 Gb/s, due to overhead requirements
24 Gb/s, because this is the maximum forwarding rate on cisco switches
What is the term that is used for the area of a network that is affected when a device or network service experiences problems?
Failure domain
Broadcast domain
User domain
Collision domain
Which type of router would an enterprise use to allow customers to access content anytime and anyplace, regardless of whether they are at home or work?
Network edge routers
Service provider routers
Modular routers
Branch routers
Which design feature will limit the size of a failure domain in an enterprise network?
The use of the building switch block approach
the purchase of enterprise equipment that is designed for large traffic volume
The use of a collapsed core design
The installation of redundant power supplies
What is a function of the distribution layer?
Interconnection of large-scale networks in wiring closets
High-speed backbone connectivity
Fault Isolation
Network access to the user
What is the function of PoE pass-through?
Allows a multilayer switch to forward IP packets at a rate close to that of layer 2 switching by bypassing the CPU
Allows a switch to disable redundant layer 2 paths in the topology to prevent layer 2 loops
Allows multiple physical switch ports to be aggregated together and act as a single logical link to increase bandwidth on trunk links
Allows switches, phones, and wireless access points to receive power over existing Ethernet cables from an upstream which
Which function is supplied by the access layer in a three-layer network design?
Network access
Backbone connectivity
High-speed connectivity
Routing
Which action should be taken when planning for redundancy on a hierarchical network design?
Purchase backup equipment for every network device at the distribution layer
Add alternate physical paths for data t traverse the network
Immediately replace a nonfunctioning module, service, or device on a network
Implement STP PortFast between the switches on the network
What is a collapsed core in a network design?
A combination of the functionality of the access, distribution, and core layers
A combination of the functionality of the distribution and core layers
A combination of the functionality of the access and core layers
A combination of the functionality of the access and distribution layers
What is the name of the layer in the Cisco borderless switched network design that is considered to be the backbone used for high-speed connectivity and fault isolation?
Access
Network access
Data link
Core
Network
Which technology is required when switched networks are designed to include redundant links?
Virtual private networks
Virtual LANs
Link aggregation
Spanning tree protocol
Which feature could be used in a network design to increase the bandwidth by combining multiple physical links into a single logical link?
Trunk ports
EtherChannel
Subinterfaces
VLANs
Which statement describes a characteristic of Cisco Catalyst 2960 switches?
They are modular switches
They do not support an active switched virtual interface (SVI) with IOS versions prior to 15.x.
They are best used as distribution layer switches
New cisco catalyst 2960-C switches support PoE pass-through
Which network design solution will best extend access layer connectivity to host devices?
Implementing routing protocols
Implementing wireless connectivity
Implementing EtherChannel
Implementing redundancy
