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Q1. - (Topic 3)
Which three approaches can be used while migrating from an IPv4 addressing scheme to an IPv6 scheme? (Choose three)
A. static mapping of IPv4 address to IPv6 addresses
B. configuring IPv4 tunnels between IPv6 islands
C. use DHCPv6 to map IPv4 addresses to IPv6 addresses
D. use proxying and translation (NAT-PT) to translate IPv6 packets into IPv4 packets
E. configure IPv6 directly
F. enable dual-stack routing
Answer: B,D,F
Explanation:
Connecting IPv6 islands with tunnels An IPv6 island is a network made of IPv6 links directly connected by IPv6 routers. In the early days of IPv6 deployment, there are many IPv6 islands. IPv6 in IPv4 tunnels are used to connect those islands together. In each island, one (or more) dual stack routers are designated to encapsulate and decapsulate IPv6 packets within IPv4 packets. Different mechanisms have been developed to manage tunnels: automatic tunnels3, configured tunnels3, tunnel brokers3, 6over43, 6to43,... Reference 2: http://www.petri.co.il/ipv6-transition.htm Network Address Translation - Protocol Translation (NAT-PT) The NAT-PT method enables the ability to either statically or dynamically configure a translation of a IPv4 network address into an IPv6 network address and vice versa. For those familiar with more typically NAT implementations, the operation is very similar but includes a protocol translation function. NAT-PT also ties in an Application Layer Gateway (ALG) functionality that converts Domain Name System (DNS) mappings between protocols.
Dual Stack The simplest approach when transitioning to IPv6 is to run IPv6 on all of the devices that are currently running IPv4. If this is something that is possible within the organizational network, it is very easy to implement. However, for many organizations, IPv6 is not supported on all of the IPv4 devices; in these situations other methods must be considered.
Reference: http://www.opus1.com/ipv6/howdoitransitiontoipv6.html
Q2. - (Topic 7)
Which option is the default switch port port-security violation mode?
A. shutdown
B. protect
C. shutdown vlan
D. restrict
Answer: A
Explanation: Shutdown—This mode is the default violation mode; when in this mode, the switch will automatically force the switchport into an error disabled (err-disable) state when a violation occurs. While in this state, the switchport forwards no traffic. The switchport can be brought out of this error disabled state by issuing the errdisable recovery cause CLI command or by disabling and reenabling the switchport.
Shutdown VLAN—This mode mimics the behavior of the shutdown mode but limits the error disabled state the specific violating VLAN.
Q3. - (Topic 7)
Which MTU size can cause a baby giant error?
A. 1500
B. 9216
C. 1600
D. 1518
Answer: C
Explanation: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/29805-175.html
Q4. - (Topic 2)
Refer to the exhibit.
How many collision domains are shown?
A. one
B. two
C. three
D. four
E. six
F. twelve
Answer: B
Explanation:
Hubs create single collision and broadcast domains, so in this case there will be a single collision domain for each of the two hubs.
Q5. - (Topic 5)
Refer to the exhibit.
A person is trying to send a file from a host on Network A of the JAX Company to a server
on Network Z of the XYZ Company. The file transfer fails. The host on Network A can communicate with other hosts on Network A.
Which command, issued from router RTA, would be the most useful for troubleshooting this problem?
A. show flash:
B. show history
C. show version
D. show interfaces
E. show controllers serial
Answer: D
Explanation:
The most useful thing to check on RTA would be the show interfaces command to see if the interface toward the WAN link is up. The most likely scenario is that the local LAN interface is up, but the other interface toward the XYZ company is down.
Q6. - (Topic 3)
Refer to the exhibit.
Why are two OSPF designated routers identified on Core-Router?
A. Core-Router is connected to more than one multi-access network.
B. The router at 208.149.23.130 is a secondary DR in case the primary fails.
C. Two router IDs have the same OSPF priority and are therefore tied for DR election
D. The DR election is still underway and there are two contenders for the role.
Answer: A
Explanation:
OSPF elects one DR per multi-access network. In the exhibit there are two DR so there must have more than one multi-access network.
Q7. - (Topic 5)
Refer to the exhibit.
An administrator cannot connect from R1 to R2. To troubleshoot this problem, the administrator has entered the command shown in the exhibit. Based on the output shown, what could be the problem?
A. The serial interface is configured for half duplex.
B. The serial interface does not have a cable attached.
C. The serial interface has the wrong type of cable attached.
D. The serial interface is configured for the wrong frame size.
E. The serial interface has a full buffer.
Answer: C
Explanation:
http://www.thebryantadvantage.com/CCNACertificationExamTutorialDirectlyConnectedSeri
alInterfaces.htm
Since the output is not forthcoming it shows that the type of cable attached is wrong,
though the cable is connected since it shows the cable type.
According to the figure DTE cable should connect to R1 on interface but while examining
using show controllers serial 0/0 command it showing that a DCE is connected so the
wrong type of cable is being used.
Q8. - (Topic 3)
Refer to the output of the corporate router routing table shown in the graphic.
The corporate router receives an IP packet with a source IP address of 192.168.214.20 and a destination address of 192.168.22.3.
What will the router do with this packet?
A. It will encapsulate the packet as Frame Relay and forward it out interface Serial 0/0.117.
B. It will discard the packet and send an ICMP Destination Unreachable message out interface FastEthernet 0/0.
C. It will forward the packet out interface Serial 0/1 and send an ICMP Echo Reply message out interface serial 0/0.102.
D. It will change the IP packet to an ARP frame and forward it out FastEthernet 0/0.
Answer: B
Explanation:
Since the destination network is not in the routing table, and no default gateway has been configured, the router will discard the packet and send an ICMP Destination Unreachable message out interface FastEthernet 0/0. It knows to send it out Fa 0/0 because the routing table for the source IP address of 192.168.214.20 shows it was learned from the Fa 0/0 interface.