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Vendor: Cisco Exam Code: 100-105 Exam Name: Interconnecting Cisco Networking Devices Part 1 v3.0 (ICND1) Version: 13.08 Q & As: 663
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QUESTION 1 Refer to the exhibit. If host A sends an IP packet to host B, what will the source physical address be in the frame when it reaches host B?
A. B. C. D. E. F.
10.168.10.99 10.168.11.88 A1:A1:A1:A1:A1:A1 B2:B2:B2:B2:B2:B2 C3:C3:C3:C3:C3:C3 D4:D4:D4:D4:D4:D4
Correct Answer: E Explanation: When packets transfer from one host to another across a routed segment, the source IP address always remains the same source IP address, and the source physical (MAC) address will be the existing router's interface address. Similarly, the destination IP address always remains the same and the destination physical (MAC) address is the destination router's interface address.
QUESTION 2 Refer to the exhibit. What kind of cable should be used to make each connection that is identified by the numbers shown?
A. 1 - Ethernet Crossover cable 2 - Ethernet straight-through cable 3 - Fiber Optic cable Guaranteed Success with EnsurePass VCE Software & PDF File
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4 - Rollover cable B. 1 - Ethernet straight-through cable 2 - Ethernet straight-through cable 3 - Serial cable 4 - Rollover cable C. 1 - Ethernet rollover cable 2 - Ethernet crossover cable 3 - Serial cable 4 - Null-modem cable D. 1 - Ethernet straight-through cable 2 - Ethernet Crossover cable 3 - Serial cable 4 - Rollover cable E. 1 - Ethernet straight-through cable 2 - Ethernet Crossover cable 3 - Serial cable 4 - Ethernet Straight-through cable Correct Answer: B Explanation: When connecting a PC to a switch, a standard Ethernet straight through cable should be used. This same cable should also be used for switch to router connections. Generally speaking, crossover cables are only needed when connecting two like devices (PC-PC, switch-switch, router-router, etc). Routers connect to frame relay and other WAN networks using serial cables. Rollover cables are special cables used for connecting to the console ports of Cisco devices.
QUESTION 3 Refer to the exhibit. What must be configured to establish a successful connection from Host A to switch SW-A through router RT-A?
A. B. C. D.
VLAN 1 on RT-A IP routing on SW-A default gateway on SW-A crossover cable connecting SW-A and RT-A
Correct Answer: C Explanation: In order for the switch to reach networks that are not local, such as networks attached to different interfaces of the router, it will need to set its default gateway to be the IP address of the attached router.
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QUESTION 4 Refer to the exhibit. SwitchA receives the frame with the addressing shown in the exhibit. According to the command output also shown in the exhibit, how will SwitchA handle this frame?
A. B. C. D. E.
It will drop the frame. It will forward the frame out port Fa0/6 only. It will forward the frame out port Fa0/3 only. It will flood the frame out all ports. It will flood the frame out all ports except Fa0/3.
Correct Answer: E Explanation: When frame receives the frame, it checks the source address on MAC table if MAC address found in MAC table it tries to forward if not in MAC table adds the Address on MAC table. After checking the source address, it checks the destination address on MAC table, if MAC address found on MAC table it forwards to proper ports otherwise floods on all ports except the source port.
QUESTION 5 Refer to the topology and switching table shown in the graphic. Host B sends a frame to Host C. What will the switch do with the frame?
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A. B. C. D. E. F.
Drop the frame Send the frame out all ports except port 0/2 Return the frame to Host B Send an ARP request for Host C Send an ICMP Host Unreachable message to Host B Record the destination MAC address in the switching table and send the frame directly to Host C
Correct Answer: B
QUESTION 6 Which network device functions only at Layer 1 of the OSI model?
A. B. C. D. E.
Option A Option B Option C Option D Option E Guaranteed Success with EnsurePass VCE Software & PDF File
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Correct Answer: B Explanation: Most hubs are amplifying the electrical signal; therefore, they are really repeaters with several ports. Hubs and repeaters are Layer 1 (physical layer) devices.
QUESTION 7 Which statements accurately describe CDP? (Choose three.) A. B. C. D. E. F.
CDP is an IEEE standard protocol. CDP is a Cisco proprietary protocol. CDP is a datalink layer protocol. CDP is a network layer protocol. CDP can discover directly connected neighboring Cisco devices. CDP can discover Cisco devices that are not directly connected.
Correct Answer: BCE Explanation: CDP (Cisco Discovery Protocol) 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 containing useful info for troubleshooting and documenting the network.
QUESTION 8 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. B. C. D. E.
application transport network physical data link
Correct Answer: E Explanation: CDP is a device discovery protocol that runs over Layer 2 (the data link layer) on all Ciscomanufactured 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-andconfiguration/cisco-discoveryprotocol.html
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QUESTION 9 Which statements are true regarding ICMP packets? (Choose two.) A. B. C. D. E.
They acknowledge receipt of TCP segments. They guarantee datagram delivery. TRACERT uses ICMP packets. They are encapsulated within IP datagrams. They are encapsulated within UDP datagrams.
Correct Answer: CD Explanation: Ping may be used to find out whether the local machines are connected to the network or whether a remote site is reachable. This tool is a common network tool for determining the network connectivity, which uses ICMP protocol instead of TCP/IP and UDP/IP. This protocol is usually associated with the network management tools, which provide network information to network administrators, such as ping and traceroute (the later also uses the UDP/IP protocol). ICMP is quite different from the TCP/IP and UDP/IP protocols. No source and destination ports are included in its packets. Therefore, usual packet-filtering rules for TCP/IP and UDP/IP are not applicable. Fortunately, a special "signature" known as the packet's Message type is included for denoting the purposes of the ICMP packet. Most commonly used message types are namely, 0, 3, 4, 5, 8, 11, and 12 which represent echo reply, destination unreachable, source quench, redirect, echo request, time exceeded, and parameter problem respectively. In the ping service, after receiving the ICMP "echo request" packet from the source location, the destination
QUESTION 10 Refer to the exhibit. Host A is sending a packet to Host B for the first time. What destination MAC address will Host A use in the ARP request?
A. B. C. D. E. F.
192.168.0.1 172.16.0.50 00-17-94-61-18-b0 00-19-d3-2d-c3-b2 ff-ff-ff-ff-ff-ff 255.255.255.255
Correct Answer: E Explanation: For the initial communication, Host A will send a broadcast ARP (all F's) to determine the correct Guaranteed Success with EnsurePass VCE Software & PDF File
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address to use to reach the destination. ARP sends an Ethernet frame called an ARP request to every host on the shared link-layer legmen. The Ethernet header includes the source host MAC address and a destination address of all Fs representing a broadcast frame. The ARP request contains the sender's MAC and IP address and the target (destination) IP address. The target's MAC address is set to all 0s. ARP Request Reference: http://www.technicalhowto.com/protocols/arp/arp.html
QUESTION 11 Refer to the exhibit. HostX is transferring a file to the FTP server. Point A represents the frame as it goes toward the Toronto router. What will the Layer 2 destination address be at this point?
A. B. C. D. E.
abcd.1123.0045 192.168.7.17 aabb.5555.2222 192.168.1.1 abcd.2246.0035
Correct Answer: E Explanation: For packets destined to a host on another IP network, the destination MAC address will be the LAN interface of the router. Since the FTP server lies on a different network, the host will know to send the frame to its default gateway, which is Toronto.
QUESTION 12 Which two statements describe the operation of the CSMA/CD access method? (Choose two.) A. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously. B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting. C. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method. D. After a collision, the station that detected the collision has first priority to resend the lost data. E. After a collision, all stations run a random backoff algorithm. When the backoff delay period has Guaranteed Success with EnsurePass VCE Software & PDF File
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expired, all stations have equal priority to transmit data. F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data. Correct Answer: BE Explanation: Ethernet networking uses Carrier Sense Multiple Access with Collision Detect (CSMA/CD), a protocol that helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium. CSMA/CD was created to overcome the problem of those collisions that occur when packets are transmitted simultaneously from different nodes. And trust me, good collision management is crucial, because when a node transmits in a CSMA/CD network, all the other nodes on the network receive and examine that transmission. Only bridges and routers can effectively prevent a transmission from propagating throughout the entire network! So, how does the CSMA/CD protocol work? Like this: when a host wants to transmit over the network, it first checks for the presence of a digital signal on the wire. If all is clear (no other host is transmitting), the host will then proceed with its transmission. But it doesn't stop there. The transmitting host constantly monitors the wire to make sure no other hosts begin transmitting. If the host detects another signal on the wire, it sends out an extended jam signal that causes all nodes on the segment to stop sending data (think, busy signal). The nodes respond to that jam signal by waiting a while before attempting to transmit again. Backoff algorithms determine when the colliding stations can retransmit. If collisions keep occurring after 15 tries, the nodes attempting to transmit will then time out.
QUESTION 13 On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or from another vendor? A. B. C. D.
RTP TCP CDP UDP
Correct 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-andconfiguration/cisco-discoveryprotocol.html
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QUESTION 14 Refer to the exhibit. A network device needs to be installed in the place of the icon labeled Network Device to accommodate a leased line attachment to the Internet. Which network device and interface configuration meets the minimum requirements for this installation?
A. B. C. D. E.
a router with two Ethernet interfaces a switch with two Ethernet interfaces a router with one Ethernet and one serial interface a switch with one Ethernet and one serial interface a router with one Ethernet and one modem interface
Correct Answer: C Explanation: Only a router can terminate a leased line attachment access circuit, and only a router can connect two different IP networks. Here, we will need a router with two interfaces, one serial connection for the line attachment and one Ethernet interface to connect to the switch on the LAN.
QUESTION 15 To what type of port would a cable with a DB-60 connector attach? A. B. C. D.
Serial port Console port Ethernet port Fibre optic port
Correct Answer: A Explanation: Serial Connection
cl_3_dte_male
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cl_2_dce The picture on the left shows a V.35 DTE cable with a male DB60 connector and a male standard 34-pin Winchester-type connector. The right picture shows a V.35 DCE serial cable with a male DB60 connector and a female 34-pin Winchester-type connector. As you probably guessed already, the male connector of the DTE cable is attached to the DCE cable's female connector, this is depicted in the picture below. This is known as a back-to- back connection, and 'simulates' a WAN link. In a real world setup, the DTE cable's male connector typically connects to a port on a CSU/DSU provided by a service provider (i.e. telco), which in turn connects to a CSU/DSU at another location, thru a T1 link for example. The DB60 connector connects to a Serial interface on a router.
cl_4_malefemale Reference: http://www.techexams.net/techlabs/ccna/lab_hardware.shtml
QUESTION 16 Refer to the exhibit. The output is from a router in a large enterprise. From the output, determine the role of the router.
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