Learn About Cisco Certified Network Associate Exam
BackBy Certification Magazine — 16 October 2008
These questions are based on 640-802: Cisco Certified Network Associate exam.A Self Test Software Practice Test
Objective: Configure, verify and troubleshoot a switch with VLANs and interswitch communications.
Sub-objective: Configure, verify and troubleshoot trunking on Cisco switches.
Single answer, multiple-choice
Which trunk encapsulation defines one VLAN on each trunk as a native VLAN?
A. ISL.
B. IEEE 802.1q
C. IEEE 802.11a
D. Auto.
Answer:
B
Tutorial:
IEEE 802.1q defines one VLAN on each trunk as the native VLAN.
The default value of a native VLAN is VLAN1. The IEEE 802.1q method does not encapsulate frames when forwarded over a trunk in a native VLAN; that is, IEEE 802.1q does not add its header information while transmitting frames in native VLAN. Frames originating from other VLANs, however, will have a 4-byte 802.1q header inserted into the frame to identify the VLAN number.
Inter Switch Link (ISL) does not define one VLAN on each trunk as a native VLAN. ISL is the Cisco proprietary trunk encapsulation, and it can only be used between two Cisco switches.
IEEE 802.11a is a wireless standard defined by the IEEE and has nothing to do with VLANs.
Auto is not an encapsulation method. The auto-trunking mode is a method for negotiating an encapsulation method over trunk links.
References:
Cisco Support > Using VLANs with Cisco Aironet Wireless Equipment > Significance of Native VLAN
CCNA ICND2 Official Exam Certification Guide (Cisco Press, ISBN 1-58720-181-X), Chapter 1: Virtual LAN Concepts, 12-15.
Objective: Implement an IP addressing scheme and IP Services to meet network requirements in a medium-size enterprise branch office network.
Sub-objective: Describe IPv6 addresses.
Multiple answer, multiple-choice
What are the three types of Internet Protocol version 6 (IPv6) addresses?
A. Anycast.
B. Broadcast.
C. Unicast.
D. Multicast.
E. Dual-Cast.
Answer:
A, C, D
Tutorial:
Unicast, multicast and anycast are types of IPv6 addresses.
The following are the different IPv6 address types:
• Unicast address: These types of addresses are used to define a single destination interface. A packet sent to a unicast address is delivered to the specific interface.
• Multicast address: These types of addresses are used to define a group of hosts. When a packet is sent to a multicast address, it is delivered to all the hosts identified by that address. Multicast addresses begin with the prefix FF00::/8 and the second octet identifies the range over which the multicast address is propagated.
o FF01:0:0:0:0:0:0:1: Indicates all-nodes address for interface-local scope.
o FF02:0:0:0:0:0:0:2: Indicates all-routers address for link-local.
• Anycast address: These types of addresses are used to identify a set of devices. These addresses also are assigned to more than one interface belonging to different nodes. A packet sent to an anycast address is delivered to just one of the interfaces, based on which is closest. For example, if an anycast address is assigned to a set of routers — one in India and another in the U.S. — the users in the U.S. will be routed to U.S. routers, and the users in India will be routed to a server located in India.
The broadcast option is incorrect because these types of addresses are not supported by IPv6. Broadcast functionality is provided by multicast addressing.
The dual-cast option is incorrect because this is not a valid Cisco address type.
References:
CCNA ICND2 Official Exam Certification Guide (Cisco Press, ISBN 1-58720-181-X), Chapter 17: IP Version 6, 600.
Objective: Configure, verify and troubleshoot basic router operation and routing on Cisco devices.
Sub-objective: Compare and contrast methods of routing and routing protocols.
Multiple answer, multiple-choice
Which of the following are classless routing protocols? (Choose three.)
A. Open Shortest Path First (OSPF).
B. Enhanced Interior Gateway Routing Protocol (EIGRP).
C. Interior Gateway Routing Protocol (IGRP).
D. Routing Information Protocol version 1 (RIPv1).
E. Border Gateway Protocol (BGP).
Answer:
A, B, E
Tutorial:
Open Shortest Path First (OSPF), Enhanced Interior Gateway Routing Protocol (EIGRP), and Border Gateway Protocol (BGP) are the classless routing protocols.
RIPv2 and Intermediate- System-to-Intermediate System (IS-IS) also are classless routing protocols.
The following are characteristics of classless routing protocols:
• The subnet mask is advertised with each route by using classless routing protocols.
• Flexible route summarization and supernetting (CIDR) are allowed in classless routing protocols.
• Classless routing protocols support Variable Length Subnet Mask (VLSM), which allows different subnets of a given IP network to be configured with different subnet masks.
The options IGRP and RIPv1 are incorrect because these are classful routing protocols.
References:
Cisco > Support > IP > IP Routing > Introduction
CCNA ICND2 Official Exam Certification Guide (Cisco Press, ISBN 1-58720-181-X), Chapter 8: Routing Protocol Theory, 315.
Objective: Implement, verify and troubleshoot NAT and ACLs in a medium-size Enterprise branch office network.
Sub-objective: Configure and apply access control lists based on network filtering requirements.
Multiple answer, multiple-choice
Which of the following represent valid ranges of access list numbers on a Cisco router for an Internet Protocol (IP) standard access list? (Choose all that apply.)
A. 1 – 99.
B. 100 – 199.
C. 1300 – 1999.
D. 2000 – 2699.
E. 1200 – 1299.
Answer:
A, C
Tutorial:
1 – 99 and 1300 – 1999 represent the ranges of IP standard access lists. On a Cisco router access list, numbers indicate the protocol and type of access list.
The following is a list of access list number ranges and their respective protocols and types:
• 1 – 99: IP standard access list.
• 100 – 199: IP extended access list.
• 1000 – 1099: IPX SAP access list.
• 1100 – 1199: Extended 48-bit MAC address access list.
• 1200 – 1299: IPX summary address access list.
• 1300 – 1999: IP standard access list (expanded range).
• 200 – 299: Protocol type-code access list.
• 2000 – 2699: IP extended access list (expanded range).
• 300 – 399: DECnet access list.
• 600 – 699: Appletalk access list.
• 700 – 799: 48-bit MAC address access list.
• 800 – 899: IPX standard access list.
• 900 – 999: IPX extended access list.
The options 100 – 199, 2000 – 2699 and 1200 – 1299 are incorrect because these are not the valid ranges of access list numbers on a Cisco router for an Internet Protocol (IP) standard access list.
References:
CCNA ICND2 Official Exam Certification Guide (Cisco Press, ISBN 1-58720-181-X), Chapter 6: IP Access Lists, 238.
Objective: Implement and verify WAN links.
Sub-objective: Configure and verify Frame Relay on Cisco routers.
Single answer, multiple-choice
Which “show” command can you use to display the status of each configured connection, traffic statistics and the number of Backward Explicit Congestion Notification (BECN) and Forward Explicit Congestion Notification (FECN) packets received by the router?
A. Show frame-relay lmi.
B. Show frame-relay pvc.
C. Show frame-relay map.
D. Show interfaces serial.
Answer:
B
Tutorial:
The show frame-relay pvc command displays the status of each configured connection, as well as traffic statistics. You can also view the number of BECN and FECN packets received by the router. This command also displays whether the interface is a Data Terminal Equipment (DTE) or Data Communications Equipment (DCE), the Data-link Connection Identifier (DLCI) number, the usage of the DLCI, status of the Permanent Virtual Circuit (PVC) and the interface of the PVC.
The show frame-relay lmi command displays LMI traffic statistics, such as LMI type, on the interface and the number of status messages between the router and the Frame Relay switch. In addition, it displays whether the interface is a DTE or DCE. It does not show BECN and FECN statistics.
The show frame-relay map command displays the network layer address and associated DLCI for each remote destination. This command displays the static mappings, as well as mappings learned from inverse ARP. It does not show BECN and FECN statistics.
The show interfaces serial command displays information about encapsulation, LMI and DLCI used for local management. It will display the encapsulation as Frame Relay, the keepalive interval, the DLCI number, the LMI type, the network address, the Maximum Transmission Unit (MTU), the bandwidth and the queuing strategy. In addition, it will display whether the line and protocol are on the interface, whether the loopback is set and whether the interface is a DTE or DCE. It does not show BECN and FECN statistics.
References:
CCNA ICND2 Official Exam Certification Guide (Cisco Press, ISBN 1-58720-181-X), Chapter 14: Frame Relay Configuration and Verification, 493-494.
