642-832, Cisco 642-832 Exam

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QUESTION NO: 1
Which two statements about the Cisco Aironet Desktop Utility (ADU) are true? (Select two)
A. The Aironet Desktop Utility (ADU) profile manager feature can create and manage only one profile for the
wireless client adapter.
B. The Aironet Desktop Utility (ADU) can support only one wireless client adapter installed and used at a time.
C. The Aironet Desktop Utility (ADU) can be used to establish the association between the client adapter and the
access point, manage authentication to the wireless network, and enable encryption.
D. The Aironet Desktop Utility (ADU) and the Microsoft Wireless Configuration Manager can be used at the
same time to configure the wireless client adapter.
Answer: B,C
Explanation:
You can configure your Cisco Aironet Wireless LAN Client Adapter through the Cisco ADU or a third-party tool,
such as the Microsoft Wireless Configuration Manager. Because third-party tools may not provide all the
functionality available in ADU, Cisco recommends that you use ADU. The Aironet Desktop Utility (ADU) can
support only one wireless client adapter as well as Aironet Desktop Utility establish the association between the
client adapter and Access Point, allows to authenticate wireless client, allows to configure encryption by setting
static WEP, WPA/WPA2 passphrase.
Section 3: Perform routine IOS device maintenance (0 Questions)
Section 4: Isolate sub-optimal internetwork operation at the correctly defined OSI Model layer (2 Questions)

QUESTION NO: 2
At which layer of the OSI model does the Spanning Tree Protocol (STP) operate at?
A. Layer 5
B. Layer 4
C. Layer 3
D. Layer 2
E. Layer 1
Answer: D
Explanation:
Spanning-Tree Protocol (STP) is a Layer 2 (L2) protocol designed to run on bridges and switches. The
specification for STP is called 802.1d. The main purpose of STP is to ensure that you do not run into a loop
situation when you have redundant paths in your network. Loops are deadly to a network.

QUESTION NO: 3
In computer networking a multicast address is an identifier for a group of hosts that have joined a multicast group.
Multicast addressing can be used in the Link Layer (OSI Layer 2), such as Ethernet Multicast, as well as at the
Internet Layer (OSI Layer 3) as IPv4 or IPv6 Multicast. Which two descriptions are correct regarding multicast
addressing?
A. The first 23 bits of the multicast MAC address are 0x01-00-5E. This is a reserved value that indicates a
multicast application.
B. The last 3 bytes (24 bits) of the multicast MAC address are 0x01-00-5E. This is a reserved value that
indicates a multicast application.
C. To calculate the Layer 2 multicast address, the host maps the last 23 bits of the IP address into the last 24 bits of
the MAC address. The high-order bit is set to 0.
D. The first 3 bytes (24 bits) of the multicast MAC address are 0x01-00-5E. This is a reserved value that
indicates a multicast application.
Answer: C,D
Explanation:
The point of this question is the form of multicast MAC address, and the conversion between the multicast MAC
address and IP address.
The multicast MAC address is 6 bytes(48 bits), the first 3 bytes (24 bits) of the multicast MAC address are
0x01-00-5E, the last 3 bytes(24 bits) of the multicast MAC address =0 + 23 bit(the last 23 bit of the IP address).
"0x01-00-5E" is a reserved value that indicates a multicast application. So option B and D are correct.

QUESTION NO: 4
EIGRP is being used as the routing protocol on the company network. While troubleshooting some network
connectivity issues, you notice a large number of EIGRP SIA (Stuck in Active) messages. What causes these SIA
routes? (Select two)
A. The neighboring router stops receiving ACB packets from this router.
B. The neighboring router starts receiving route updates from this router.
C. The neighboring router is too busy to answer the query (generally caused by high CPU utilization).
D. The neighboring router is having memory problems and cannot allocate the memory to process the query or
build the reply packet.
Answer: C,D
Explanation:
SIA routes are due to the fact that reply packets are not received. This could be caused by a router which is
unable to send reply packets. The router could have reached the limit of its capacity, or it could be
malfunctioning.
Incorrect Answers:
A: Missing replies, not missing ACBs, cause SIA.
B: Routes updates do not cause SIA.Notes: If a router does not receive a reply to all outstanding queries within 3
minutes, the route goes to the stuck in active (SIA) state. The router then resets the neighbors that fail to reply by
going active on all routes known through that neighbor, and it re-advertises all routes to that neighbor.Reference:
Enhanced Interior Gateway Routing Protocolhttp://www.cisco.com/warp/public/103/eigrp3.html

QUESTION NO: 5
Part of the routing table of router R1 is displayed below:
S 62.99.153.0/24 [1/0] via 209.177.64.130 172.209.12.0/32 is subnetted, 1 subnets D EX 172.209.1 [170/2590720]
via 209.179.2.114, 06:47:28, Serial0/0/0.1239 62.113.17.0/24 is variably subnetted, 2 subnets, 2 masks D EX
99.3.215.0/24 [170/27316] via 209.180.96.45, 09:52:10, FastEthernet11/0/0 [170/27316] via 209.180.96.44,
09:52:10, FastEthernet11/0/0 25.248.17.0/24 [90/1512111] via 209.179.66.25, 10:33:13, Serial0/0/0.1400001
[90/1512111] via 209.179.66.41, 10:33:13, Serial0/0/0.1402001 62.113.1.0/24 is variably subnetted, 12 subnets, 2
masks D 62.113.1.227/32
[90/2611727] via 209.180.96.45, 10:33:13, FastEthernet1/0/0 [90/2611727]
via 209.180.96.44, 10:33:13, FastEthernet1/0/0 S* 0.0.0.0/0 [1/0] via
209.180.96.14
From analyzing the above command output, what is the administrative distance of the external EIGRP routes?
A. 24
B. 32
C. 90
D. 170
E. 27316
F. None of the other alternatives apply
Answer: D
Explanation:
By default an external EIGRP route has a value of 170. By examining the exhibit we see that this default value of
the external EIGRP routes (see D-EX in exhibit) indeed is set to 170. The first value within the brackets display the
AD, so with a value of [170/27316] the AD is 170 and the metric of the route is 27316.
Incorrect Answers:
A: This is the subnet mask used for some of the routes in the table.
B: This is the subnet mask used for some of the routes in the table.
C: This is the AD of the internal EIGRP routes, which is the default
E: This is the EIGRP metric of the external EIGRP routes.Reference: What Is Administrative
Distance?http://www.cisco.com/warp/public/105/admin_distance.html