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Q71. - (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 

Q72. - (Topic 7) 

Under which circumstance should a network administrator implement one-way NAT? 

A. when the network must route UDP traffic 

B. when traffic that originates outside the network must be routed to internal hosts 

C. when traffic that originates inside the network must be routed to internal hosts 

D. when the network has few public IP addresses and many private IP addresses require outside access 

Answer: B 

Explanation: NAT operation is typically transparent to both the internal and external hosts. Typically the internal host is aware of the true IP address and TCP or UDP port of the external host. Typically the NAT device may function as the default gateway for the internal host. However the external host is only aware of the public IP address for the NAT device and the particular port being used to communicate on behalf of a specific internal host. 

NAT and TCP/UDP 

"Pure NAT", operating on IP alone, may or may not correctly parse protocols that are totally concerned with IP information, such as ICMP, depending on whether the payload is interpreted by a host on the "inside" or "outside" of translation. As soon as the protocol stack is traversed, even with such basic protocols as TCP and UDP, the protocols will break unless NAT takes action beyond the network layer. IP packets have a checksum in each packet header, which provides error detection only for the header. IP datagrams may become fragmented and it is necessary for a NAT to reassemble these fragments to allow correct recalculation of higher-level checksums and correct tracking of which packets belong to which connection. The major transport layer protocols, TCP and UDP, have a checksum that covers all the data they carry, as well as the TCP/UDP header, plus a "pseudo-header" that contains the source and destination IP addresses of the packet carrying the TCP/UDP header. For an originating NAT to pass TCP or UDP successfully, it must recompute the TCP/UDP header checksum based on the translated IP addresses, not the original ones, and put that checksum into the TCP/UDP header of the first packet of the fragmented set of packets. The receiving NAT must recompute the IP checksum on every packet it passes to the destination host, and also recognize and recompute the TCP/UDP header using the retranslated addresses and pseudo-header. This is not a completely solved problem. One solution is for the receiving NAT to reassemble the entire segment and then recompute a checksum calculated across all packets. The originating host may perform Maximum transmission unit (MTU) path discovery to determine the packet size that can be transmitted without fragmentation, and then set the don't fragment (DF) bit in the appropriate packet header field. Of course, this is only a one-way solution, because the responding host can send packets of any size, which may be fragmented before reaching the NAT. 

Q73. - (Topic 3) 

Which IOS command is used to initiate a login into a VTY port on a remote router? 

A. router# login 

B. router# telnet 

C. router# trace 

D. router# ping 

E. router(config)# line vty 0 5 

F. router(config-line)# login 

Answer: B 

Explanation: 

VTY ports are telnet ports hence command B will initiate login to the telnet port. 

Q74. - (Topic 3) 

Which two statements describe the process identifier that is used in the command to configure OSPF on a router? (Choose two.) 

Router(config)# router ospf 1 

A. All OSPF routers in an area must have the same process ID. 

B. Only one process number can be used on the same router. 

C. Different process identifiers can be used to run multiple OSPF processes 

D. The process number can be any number from 1 to 65,535. 

E. Hello packets are sent to each neighbor to determine the processor identifier. 

Answer: C,D 

Explanation: 

Multiple OSPF processes can be configured on a router using multiple process ID’s. 

The valid process ID’s are shown below: Edge-B(config)#router ospf <1-65535> Process ID 

Q75. - (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. 

Q76. - (Topic 5) 

Refer to the exhibit. 

After the power-on-self test (POST), the system LED of a Cisco 2950 switch turns amber. What is the status of the switch? 

A. The POST was successful. 

B. The switch has a problem with the internal power supply and needs an external power supply to be attached. 

C. POST failed and there is a problem that prevents the operating system from being loaded. 

D. The switch has experienced an internal problem but data can still be forwarded at a slower rate. 

E. The switch passed POST, but all the switch ports are busy. 

Answer: C 

Explanation: 

http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a00801 25913.shtml 

Each time you power up the switch, eight Power-On Self Tests (POSTs) run automatically. POSTs check the most important system components before the switch begins to forward packets. When the switch begins the POST, the port status LEDs display amber for two seconds, and then display green. As each test runs, the port status LEDs go out. 1x is the first to go out. The port status LEDs for ports 2x through 8x go out sequentially as the system completes a test. When the POST completes successfully, the port status LEDs go out. This indicates that the switch is operational. If a test fails, the port status LED associated with the test displays amber. The system LED also displays amber. Not E: From Cisco IOS Software Release 11.2(8.5) SA6 onwards, the port and system LEDs both remain amber after a POST failure. In the earlier Cisco IOS Software Releases, only the LEDs of failed linked ports remained amber. 

Q77. - (Topic 3) 

How many bits are contained in each field of an IPv6 address? 

A. 24 

B. 4 

C. 8 

D. 16 

Answer: D 

Explanation: 

One of the key advantages IPv6 brings is the exponentially larger address space. The 

following will outline the basic address architecture of IPv6. 128-bit-long addresses Represented in hexadecimal format: Uses CIDR principles: prefix/prefix length x:x:x:x:x:x:x:x, where x is a 16-bit hex field The last 64 bits are used for the interface ID http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd 8026003d.pdf 

Q78. - (Topic 5) 

Refer to the exhibit. 

A network administrator has configured a Catalyst 2950 switch for remote management by pasting into the console the configuration commands that are shown in the exhibit. However, a Telnet session cannot be successfully established from a remote host. What should be done to fix this problem? 

A. Change the first line to interface fastethernet 0/1. 

B. Change the first line to interface vlan 0/1. 

C. Change the fifth line to ip default-gateway 192.168.17.241. 

D. Change the fifth line to ip route 0.0.0.0 0.0.0.0 192.168.17.1. 

E. Change the sixth line to line con 0. 

Answer: C 

Explanation: 

The default gateway must reside on the same IP subnet as the device. Here, the subnet mask for the VLAN interface is /228. Only choice C will fix this issue, as then the default gateway is on the same subnet as the 2950. 

Q79. - (Topic 7) 

Which NAT type is used to translate a single inside address to a single outside address? 

A. dynamic NAT 

B. NAT overload 

C. PAT 

D. static NAT 

Answer: D 

Explanation: 

Network address translation (NAT) is the process of modifying IP address information in 

IP packet headers while in transit across a traffic routing device. 

There are two different types of NAT: . NAT . PAT 

Q80. - (Topic 1) 

At which layer of the OSI model does the protocol that provides the information that is displayed by the show cdp neighbors command operate? 

A. application 

B. transport 

C. network 

D. physical 

E. data link 

Answer: E 

Explanation: 

CDP is a device discovery protocol that runs over Layer 2 (the data link layer) on all Cisco-manufactured devices (routers, bridges, access servers, and switches) and allows network management applications to discover Cisco devices that are neighbors of already known devices. With CDP, network management applications can learn the device type and the Simple Network Management Protocol (SNMP) agent address of neighboring devices running lower-layer, transparent protocols. CDP allows devices to share basic configuration information without even configuring any protocol specific information and is enabled by default on all interfaces. CDP is a Datalink Protocol occurring at Layer 2 of the OSI model. CDP is not routable and can only go over to directly connected devices. CDP is enabled, by default, on all Cisco devices. CDP updates are generated as multicasts every 60 seconds with a hold-down period of 180 seconds for a missing neighbor. The no cdp run command globally disables CDP, while the no cdp enable command disables CDP on an interface. Use show cdp neighbors to list out your directly connected Cisco neighboring devices. Adding the detail parameter will display the layer-3 addressing configured on the neighbor. 

Reference: http://computernetworkingnotes.com/cisco-devices-administration-and-configuration/cisco-discoveryprotocol.html