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Q231. Which statement about WAN Ethernet Services is true?
A. Rate-limiting can be configured per EVC.
B. Point-to-point processing and encapsulation are performed on the customer network.
C. Ethernet multipoint services function as a multipoint-to-multipoint VLAN-based connection.
D. UNIs can perform service multiplexing and all-in-one bundling.
Answer: A
Explanation:
The MEF has defined a set of bandwidth profiles that can be applied at the UNI or to an EVC. A bandwidth profile is a limit on the rate at which Ethernet frames can traverse the UNI or the EVC.
Reference: http://www.ciscopress.com/articles/article.asp?p=101367&seqNum=2
Q232. Which two options are signaling protocols that are used in MPLS? (Choose two.)
A. LDP
B. RSVP
C. BFD
D. LISP
E. CLNS
F. CDP
Answer: A,B
Explanation:
* Signaling is the means by which LSRs all along the path know that they are a part of a given LSP. It is a signaling function by which the LSR knows that the internal transit path for the LSP depicted goes from Interface 2 to Interface 4.
* Label distribution is the means by which an LSR tells an upstream LSR what label value to use for a particular LSP.
There are four protocols that can perform the label distribution function:
* Label Distribution Protocol (LDP)
* Resource Reservation Protocol with Traffic Engineering Extensions (RSVP-TE)
* Constraint-Based Routed LDP (CR-LDP)
* Multiprotocol BGP
LDP and RSVP-TE are the two most commonly used label distribution protocols
Reference: http://www.networkworld.com/article/2237487/cisco-subnet/understanding-mpls-label-distribution.html
Q233. DRAG DROP
Drag and drop the BGP attribute on the left to the correct category on the right.
Answer:
Q234. Which two statements are true about AAA? (Choose two.)
A. AAA can use RADIUS, TACACS+, or Windows AD to authenticate users.
B. If RADIUS is the only method configured in AAA, and the server becomes unreachable,
the user will be able to log in to the router using a local username and password.
C. If the local keyword is not included and the AAA server does not respond, then authorization will never be possible and the connection will fail.
D. AAA can be used to authenticate the enable password with a AAA server.
Answer: C,D
Explanation:
AAA can be used to authenticate user login and the enable passwords.
Example 1: Same Exec Authentication Methods for All Users
Once authenticated with:
aaa authentication login default group radius local
All users who want to log in to the access server have to be authorized using Radius (first method) or local database (second method).
We configure:
aaa authorization exec default group radius local
Note. On the AAA server, Service-Type=1 (login) must be selected.
Note. With this example, if the local keyword is not included and the AAA server does not respond, then authorization will never be possible and the connection will fail.
Reference: http://www.cisco.com/c/en/us/support/docs/security-vpn/terminal-access-controller-access-control-system-tacacs-/10384-security.html
Q235. Which option is the default maximum age of the MAC address table?
A. 300 seconds
B. 500 seconds
C. 1200 seconds
D. 3600 seconds
Answer: A
Explanation:
To configure the maximum aging time for entries in the Layer 2 table, use the mac-address-table aging-time command in global configuration mode.
Syntax Description
seconds
MAC address table entry maximum age. Valid values are 0, and from 5 to 1000000 seconds. Aging time is counted from the last time that the switch detected the MAC address. The default value is 300 seconds.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/lanswitch/command/reference/lsw_book/lsw_m1. html
Improved 400-101 practice test:
Q236. Refer to the exhibit.
R1 is configured as shown. R1 is able to establish a neighbor adjacency only with R2. Which addition must you make to the R1 configuration to allow it to establish an adjacency with R3?
A. interface gigabitethernet 0/1
ip address 10.1.0.1 255.255.255.0
ip ospf network point-to-point
B. interface gigabitethernet 0/1
ip address 10.1.0.1 255.255.255.0
ip ospf 1 area 0
C. router ospf 1
network 10.1.0.0 0.0.0.255 area 1
D. router ospf 1
area 0 stub
Answer: C
Explanation:
To enable interfaces and networks with OSPF, the networks need to be specified in the network statement. In the configuration shown, only 10.0.0.0/24 has been enabled, we are missing the network connecting to R3 (10.1.0.0/24).
Q237. Which statement is true about LLDP?
A. LLDP provides VTP support.
B. LLDP does not use a multicast address to communicate.
C. LLDP can indicate only the duplex setting of a link, and not the speed capabilities.
D. LLDP does not support native VLAN indication.
Answer: D
Explanation:
Cisco Discovery Protocol Versus LLDP-MED TLV Comparison
TLV Function
LLDP TLV
Cisco Discovery Protocol TLV
Native VLAN support-Indicates the native VLAN
No
Native VLAN TLV
Reference: http://www.cisco.com/en/US/technologies/tk652/tk701/technologies_white_paper0900aecd 804cd46d.html
Q238. Which two statements about the client-identifier in a DHCP pool are true? (Choose two.)
A. It specifies a unique identifier that is used only for DHCP requests.
B. It is specified by appending 01 to the MAC address of a DHCP client.
C. It specifies a hardware address for the client.
D. It specifies a unique identifier that is used only for BOOTP requests.
E. It requires that you specify the hardware protocol.
Answer: A,B
Reference:
client-identifier unique-identifier
Example:
Device(dhcp-config)# client-identifier 01b7.0813.8811.66
Specifies the unique identifier for DHCP clients.
This command is used for DHCP requests.
DHCP clients require client identifiers. You can specify the unique identifier for the client in either of the following ways:
A 7-byte dotted hexadecimal notation. For example, 01b7.0813.8811.66, where 01 represents the Ethernet media type and the remaining bytes represent the MAC address of the DHCP client.
A 27-byte dotted hexadecimal notation. For example, 7665.6e64.6f72.2d30.3032.342e.3937.6230.2e33.3734.312d.4661.302f.31. The equivalent ASCII string for this hexadecimal value is vendor-0024.97b0.3741-fa0/1, where vendor represents the vendor, 0024.97b0.3741 represents the MAC address of the source interface, and fa0/1 represents the source interface of the DHCP client.
See the Troubleshooting Tips section for information about how to determine the client identifier of the DHCP client.
Note
The identifier specified here is considered for a DHCP client that sends a client identifier in the packet.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/15-mt/dhcp-15-mt-book/config-dhcp-server.html
Q239. What is the ip dhcp snooping information option command used for?
A. It displays information about the DHCP snooping table.
B. It sends a syslog and an SNMP trap for a DHCP snooping violation.
C. It enables the DHCP snooping host tracking feature.
D. It enables DHCP option 82 data insertion.
Answer: D
Explanation:
To enable DHCP option-82 data insertion, perform this task:
Command
Purpose
Step 1
Router(config)# ip dhcp snooping information option
Enables DHCP option-82 data insertion.
Step 2
Router(config)# ip dhcp snooping information option replace
Or:
Router(config-if)# ip dhcp snooping information option replace
(Optional) Replaces the DHCP relay information option received in snooped packets with the switch's option-82 data.
Step 3
Router(config)# do show ip dhcp snooping | include 82
Verifies
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/snoodhcp.html
Q240. Refer to exhibit.
The router is unreachable using telnet. Which option is solution?
A. Use an extended access list instead of standard access list.
B. The transport output telnet command must be added.
C. The VRF configuration must be completed.
D. The “vrf-also” keyword must be added to the access-class configuration.
Answer: D