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Q1. - (Topic 7)
Which statement about unicast frame forwarding on a switch is true?
A. The TCAM table stores destination MAC addresses
B. If the destination MAC address is unknown, the frame is flooded to every port that is configured in the same VLAN except on the port that it was received on.
C. The CAM table is used to determine whether traffic is permitted or denied on a switch
D. The source address is used to determine the switch port to which a frame is forwarded
Answer: B
Q2. - (Topic 1)
How does a switch differ from a hub?
A. A switch does not induce any latency into the frame transfer time.
B. A switch tracks MAC addresses of directly-connected devices.
C. A switch operates at a lower, more efficient layer of the OSI model.
D. A switch decreases the number of broadcast domains.
E. A switch decreases the number of collision domains.
Answer: B
Explanation:
Some of the features and functions of a switch include:
A switch is essentially a fast, multi-port bridge, which can contain dozens of ports.
Rather than creating two collision domains, each port creates its own collision domain.
In a network of twenty nodes, twenty collision domains exist if each node is plugged into its
own switch port.
If an uplink port is included, one switch creates twenty-one single-node collision domains.
A switch dynamically builds and maintains a Content-Addressable Memory (CAM) table,
holding all of the necessary MAC information for each port.
For a detailed description of how switches operate, and their key differences to hubs, see
the reference link below.
Reference: http://www.cisco.com/warp/public/473/lan-switch-cisco.shtml
Q3. - (Topic 2)
Which two options will help to solve the problem of a network that is suffering a broadcast storm? (Choose two.)
A. a bridge
B. a router
C. a hub
D. a Layer 3 switch
E. an access point
Answer: B,D
Explanation:
Routers and layer 3 switches will not propagate broadcast traffic beyond the local segment, so the use of these devices is the best method for eliminating broadcast storms.
Q4. - (Topic 3)
OSPF is configured using default classful addressing. With all routers and interfaces operational, how many networks will be in the routing table of R1 that are indicated to be learned by OSPF?
A. 2
B. 3
C. 4
D. 5
E. 6
F. 7
Answer: C
Explanation:
Although OSPF is configured using default classful addressing but OSPF is a link-state routing protocol so it will always send the subnet mask of each network in their advertised routes. Therefore R1 will learn the the complete subnets. Four networks list below will be in the routing table of R1:+ 172.16.2.64/30+ 172.16.2.228/30+ 172.16.2.232/30+ 172.16.3.0/24 Note: Other networks will be learned as “Directly connected” networks (marked with letter “C”)
Q5. - (Topic 1)
On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or from another vendor?
A. RTP
B. TCP
C. CDP
D. UDP
Answer: C
Explanation:
The Cisco Unified IP Phone uses CDP to communicate information such as auxiliary VLAN ID, per port power management details, and Quality of Service (QoS) configuration information with the Cisco Catalyst switch. Cisco Discovery Protocol (CDP) is a proprietary protocol designed by Cisco to help administrators collect information about both locally attached and remote devices. By using CDP, you can gather hardware and protocol information about neighbor devices, which is useful info for troubleshooting the network. CDP messages are generated every 60 seconds as multicast messages on each of its active interfaces. The information shared in a CDP packet about a Cisco device includes the following: Name of the device configured with the hostname command IOS software version Hardware capabilities, such as routing, switching, and/or bridging Hardware platform, such as 2600, 2950, or 1900 The layer-3 address(es) of the device The interface the CDP update was generated on
Reference: http://computernetworkingnotes.com/cisco-devices-administration-and-configuration/cisco-discoveryprotocol.html
Q6. - (Topic 3)
Which two of these statements are true of IPv6 address representation? (Choose two.)
A. There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.
B. A single interface may be assigned multiple IPv6 addresses of any type.
C. Every IPv6 interface contains at least one loopback address.
D. The first 64 bits represent the dynamically created interface ID.
E. Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.
Answer: B,C
Explanation:
A single interface may be assigned multiple addresses of any type (unicast, anycast,
multicast).
Every IPv6-enabled interface must contain at least one loopback and one link-local
address.
Optionally, every interface can have multiple unique local and global addresses.
IPv6 host addresses can be assigned in multiple ways:
Static configuration
Stateless autoconfiguration
DHCPv6
When IPv6 is used over Ethernet networks, the Ethernet MAC address can be used to
generate the 64-bit interface ID for the host. This is called the EUI-64 address.
Since MAC addresses use 48 bits, additional bits must be inserted to fill the 64 bits
required.
Reference:
http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd
8026003d.pdf
Q7. - (Topic 2)
How many simultaneous Telnet sessions does a Cisco router support by default?
A. 1
B. 2
C. 3
D. 4
E. 5
F. 6
Answer: E
Explanation:
By default, Cisco routers support virtual terminal interfaces 0-4 (5 total) which are used for telnet sessions.
Q8. - (Topic 5)
Refer to the exhibit.
An administrator replaced the 10/100 Mb NIC in a desktop PC with a 1 Gb NIC and now the PC will not connect to the network. The administrator began troubleshooting on the switch. Using the switch output shown, what is the cause of the problem?
A. Speed is set to 100Mb/s.
B. Input flow control is off.
C. Encapsulation is set to ARPA.
D. The port is administratively down.
E. The counters have never been cleared.
Answer: A
Explanation:
For PC to switch connectivity, the speed settings must match. In this case, the 1 Gb NIC will not be able to communicate with a 100Mb fast Ethernet interface, unless the 1Gb NIC can be configured to connect at 100Mb.