Actualtests CCNA 640-816
Interconnecting Cisco Networking Devices Part 2 : 640-816 Exam
640-816 ICND2
Interconnecting Cisco Networking Devices Part 2
Exam Number: 640-816 ICND2
Associated Certifications: CCNA
Duration: 75 minutes (45-55 questions)
Available Languages: English
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
The 640-816 Interconnecting Cisco Networking Devices Part 2 (ICND2) is the exam associated with the Cisco Certified Network Associate certification. Candidates can prepare for this exam by taking the Interconnecting Cisco Networking Devices Part 2 (ICND2) v1.0 course. This exam tests a candidate’s knowledge and skills required to successfully install, operate, and troubleshoot a small to medium size enterprise branch network. The exam covers topics on VLSM and IPv6 addressing; extending switched networks with VLANs; configuring, verifying and troubleshooting VLANs; the VTP, RSTP, OSPF and EIGRP protocols; determining IP routes; managing IP traffic with access lists; NAT and DHCP; establishing point-to- point connections; and establishing Frame Relay connections.
Exam Topics
The following topics are general guidelines for the content likely to be included on the Interconnecting Cisco Networking Devices Part 2 exam. However, other related topics may also appear on any specific delivery of the exam. In order to better reflect the contents of the exam and for clarity purposes, the guidelines below may change at any time without notice.
Configure, verify and troubleshoot a switch with VLANs and interswitch communications
Describe enhanced switching technologies (including: VTP, RSTP, VLAN, PVSTP, 802.1q)
Describe how VLANs create logically separate networks and the need for routing between them
Configure, verify, and troubleshoot VLANs
Configure, verify, and troubleshoot trunking on Cisco switches
Configure, verify, and troubleshoot interVLAN routing
Configure, verify, and troubleshoot VTP
Configure, verify, and troubleshoot RSTP operation
Interpret the output of various show and debug commands to verify the operational status of a Cisco switched network
Implement basic switch security (including: port security, unassigned ports, trunk access, etc.)
Implement an IP addressing scheme and IP Services to meet network requirements in a medium-size Enterprise branch office network
Calculate and apply a VLSM IP addressing design to a network
Determine the appropriate classless addressing scheme using VLSM and summarization to satisfy addressing requirements in a LAN/WAN environment
Describe the technological requirements for running IPv6 (including: protocols, dual stack, tunneling, etc)
Describe IPv6 addresses
Identify and correct common problems associated with IP addressing and host configurations
Configure and troubleshoot basic operation and routing on Cisco devices
Compare and contrast methods of routing and routing protocols
Configure, verify and troubleshoot OSPF
Configure, verify and troubleshoot EIGRP
Verify configuration and connectivity using ping, traceroute, and telnet or SSH
Troubleshoot routing implementation issues
Verify router hardware and software operation using SHOW & DEBUG commands
Implement basic router security
Implement, verify, and troubleshoot NAT and ACLs in a medium-size Enterprise branch office network.
Describe the purpose and types of access control lists
Configure and apply access control lists based on network filtering requirements
Configure and apply an access control list to limit telnet and SSH access to the router
Verify and monitor ACL’s in a network environment
Troubleshoot ACL implementation issues
Explain the basic operation of NAT
Configure Network Address Translation for given network requirements using CLI
Troubleshoot NAT implementation issues
Implement and verify WAN links
Configure and verify Frame Relay on Cisco routers
Troubleshoot WAN implementation issues
Describe VPN technology (including: importance, benefits, role, impact, components)
Configure and vary PPP connection between Cisco routers
Exam Number/Code: 640-816
Exam Name:Interconnecting Cisco Networking Devices Part 2
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QUESTION 11:
Which two of the following values does STP take into consideration when it elects
the root bridge? (Select two answer choices)
A. The BPDU version number
B. The access layer bridge setting
C. The Bridge ID
D. The spanning-tree update number
E. The bridge priority
F. The VLAN number
Answer: C, E
Explanation:
The bridges elect a root bridge based on the bridge IDs in the BPDUs. The root bridge is
the bridge with the lowest numeric value for the bridge ID. Because the two part bridge
ID starts with the priority value, essentially the bridge with the lowest priority becomes
the root. For instance, if one bridge has priority 100, and another bridge has priority 200,
the bridge with priority 100 wins, regardless of what MAC address was used to create the
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bridge ID or each bridge/switch.
Reference: CCNA Self-Study CCNA ICND Exam Certification Guide (Cisco Press,
ISBN 1-58720-083-X) Page 39
QUESTION 12:
Which of the following are spanning tree port states? (Select three answer choices)
A. Learning
B. Spanning
C. Listening
D. Forwarding
E. Initializing
F. Filtering
G. Permitting
Answer: A, C, D
Explanation:
There are 4 STP states that a bridge port can be in: Blocking, Listening, Learning, and
Forwarding:
QUESTION 13:
What are the switch and bridge port characteristics of a layer two spanning-tree
network that is fully converged?
A. All switch and bridge ports are in the forwarding state.
B. All switch and bridge ports are in the stand-by state.
C. All switch and bridge ports are assigned as either root or designated ports.
D. All switch and bridge ports are in either the forwarding or blocking state.
E. All switch and bridge are either blocking or looping.
Answer: D
Explanation:
When a switch first comes up, it will be in the listening and learning states. This is
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needed so that the switch learns the MAC addresses of the devices on the LAN, and to
learn where any loops in the network may exist. After this initial period of listening and
learning, the ports will be forwarding to the hosts, or blocking certain ports that create a
loop in the network. An example of this is shown below:
In the above figure, after the network has converged, spanning tree protocol puts each
port either in designated (Forwarding) or Non-designated (Blocking) state. So, Choice D
is correct.
If you get a converged spanning-tree network, you have only two port states.
Forwarding and Blocking. Forwarding: all traffic will be forwarded
Blocking: all traffic to devices that will create a loop in a spanning-tree network will be
blocked. It is possible to get redundant paths in large switched and routed networks.
QUESTION 14:
The Certkiller LAN consists of 6 switches connected together as shown in the
diagram below:
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What is the name of the potential problem of this switch setup, and what protocol
can prevents its occurrence. (Select only one answer choice)
A. Routing loops, hold down timers
B. Switching loops, split horizon
C. Routing loops, split horizon
D. Switching loops, VTP
E. Routing loops, STP
F. Switching loops, STP
Answer: F
Explanation:
The spanning-Tree Protocol (STP) prevents loops from being formed when switches or
bridges are interconnected via multiple paths. Spanning-Tree Protocol implements the
802.1D IEEE algorithm by exchanging BPDU messages with other switches to detect
loops, and then removes the loop by shutting down selected bridge interfaces. This
algorithm guarantees that there is one and only one active path between two network
devices.
QUESTION 15:
In a switched LAN network, what is the Spanning-Tree algorithm used for?
A. It is used to provide a mechanism for routing updates in switched environments.
B. It is used to prevent routing loops in networks with redundant routes.
C. It is used to prevent switching loops in networks with redundant switched routes.
D. It is used to manage, the addition, deletion, and naming of VLANs across multiple
switches.
E. It is used to segment a network into multiple collision domains.
F. None of the above.
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G. All of the above are functions of STP.
Answer: C
Explanation:
To avoid loops, all bridging devices, including switches, use STP. STP causes each
interface on a bridging device to settle into a blocking state or a forwarding state.
Blocking means that the interface cannot forward or receive data frames. Forwarding
means that the interface can send and receive data frames. By having a correct subset of
the interfaces blocked, a single currently active logical path will exist between each pair
of LANs. STP resides at the data link layer, so it is used to prevent loops within a
switched network. It is not used to prevent routing loops; that is the function of the
mechanisms within a routing protocol.
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN
1-58720-094-5) page 248.
QUESTION 16:
In which Spanning-Tree states does a switch port learn MAC addresses? (Select
two)
A. Blocking
B. Listening
C. Forwarding
D. Learning
E. Relaying
Answer: C, D
Explanation:
STP uses a couple of port states besides forwarding and blocking.
1. Listening - Listens to incoming Hello messages to ensure that there are no loops, but
does not forward traffic. This is an interim state between blocking and forwarding.
2. Learning - Still listens to BPDUs, plus learns MAC addresses from incoming frames. It
does not forward traffic. This is an interim state between blocking and forwarding.
3. Disabled - Administratively down.
Reference: Cisco CCNA intro 640-821
QUESTION 17:
Three Certkiller switches are connected together as shown in the diagram below:
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Study the Exhibit carefully. All switches have the default STP configuration and all
links are Fast Ethernet. Which port on which switch will Spanning Tree place in
blocking mode?
A. Switch CK1 - Port Fa1/1
B. Switch CK1 - Port Fa1/2
C. Switch CK2 - Port Fa1/2
D. Switch CK2 - Port Fa1/1
E. Switch CK3 - Port Fa1/1
F. Switch CK3 - Port Fa1/2
Answer: F
Explanation:
Switch CK1 will become the ROOT BRIDGE because it has the lowest MAC address.
Its both ports will become designated ports so choice A and B are wrong.
Next Election will be of ROOT PORTS. Port FA1/1 of both the switches CK2 and CK3
will become ROOT ports because they have minimum path cost to reach the root bridge.
So, choices D and E are also wrong.
Next Election will be of Designated Ports on the segment connecting CK2 and CK3 . CK2
has lower MAC address so, its port FA1/2 will become designated port and FA1/2 of
CK3 will be placed in a BLOCKING state to avoid switching LOOPS.
QUESTION 18:
Four Certkiller switches are connected together as shown below:
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The network shown in the exhibit was designed to provide reliability through
redundancy. Both of the IDF switches, CK3 , and CK4 , are connected to both of the
MDF switches, CK1 and CK2 . Which configuration scenario will provide a loop-free
switching environment?
A. Spanning Tree Protocol should be running on all switches.
B. Spanning Tree Protocol should be running on only the MDF switches CK1 and CK2 .
C. Spanning Tree Protocol should be running on only the IDF switches CK3 and CK4 .
D. Spanning Tree Protocol should be run only on the root bridge.
E. Spanning Tree Protocol is not needed in this network.
Answer: A
Explanation:
Spanning-Tree Protocol (STP) prevents loops from being formed when switches or
bridges are interconnected via multiple paths. Spanning-Tree Protocol implements the
802.1D IEEE algorithm by exchanging BPDU messages with other switches to detect
loops, and then removes the loop by shutting down selected bridge interfaces. This
algorithm guarantees that there is one and only one active path between two network
devices.
Reference:
http://www.cisco.com/en/US/tech/ CK3 89/ CK6 21/tsd_technology_support_protocol_home.html
QUESTION 19:
Four Certkiller switches are connected together as shown in the diagram below:
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Study the Exhibit carefully. What is the purpose of the Spanning Tree Protocol that
is operating in the exhibited switch topology?
A. To elect a particular switch as backup designated switch.
B. To have one active Layer 2 path through the switches network.
C. To select the best path to a remote destination that is on a different network.
D. To learn the MAC addresses of host attached to the switches network.
E. To distribute VLAN configuration information throughout the switched network.
Answer: B
Explanation:
Switches are connected in a way to provide full-mesh topology. So, a redundant path is
provided in the case of a link or switch failure. The STP is used to prevent frames from
looping throughout the network.
QUESTION 20:
When is a switched network that is running the Spanning Tree Protocol considered
to be fully converged?
A. when all switches have the same BID as the root switch
B. when all switches have received the MAC address of each neighboring switch
C. when every enabled switch port has been assigned a unique identifier
D. when every operating switch port is in either the blocking or forwarding state
E. when all switches are in either client, server, or transparent mode
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