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350-027 : CCIE Written: Metro Ethernet Last Updated Friday, April 18, 2008 with 252 Questions

CCIE Written: Metro Ethernet
Exam Number: 350-027 Exam
Associated Certifications: CCIE Written: Metro Ethernet
Duration: 400 Q&As

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QUESTION 1:
Which statements are true regarding ATM-Ethernet PW Interworking? Select two.
A. IP Interworking is supported.
B. Ethernet Interworking is supported.
C. LLC Interworking is supported.
D. ATM-Ethernet Interworking is not possible.
Answer: A, B
Explanation: See Table 1 at:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1838/products_feature_guide09186a008029b264.html
QUESTION 2:
To eliminate the need for adjacent routers on broadcast networks to form n(n-1)/2 adjacencies, IS-IS
defines a pseudonode or Designated intermediate System, DIS. All router on the broadcast medium form
an adjacency with the DIS. The Backup DIS is called:
A. Redundant DIS
B. BDR
C. There is no concept of a backup DIS in IS-IS
D. Designated Redundant System
Answer: C
1) http://www.cisco.com/warp/public/97/DIS-LSP-1.html
“On broadcast multi-access networks, a single router is elected as the DIS. There is no backup DIS elected. The
DIS is the router that creates the pseudonode and acts on behalf of the pseudonode.”
2) http://www.cisco.com/warp/public/97/is-is-ip-config.html
“Notice that the DIS is elected for both levels, and that no backup DIS exists, as with Open Shortest Path First
(OSPF), which has a backup Designated Router (DR).”
3) http://www.ciscopress.com/articles/article.asp?p=31319&rl=1
“No backup DIS exists in IS-IS, in contrast to the backup DR for OSPF. If a DIS dies, a new election takes
place”
QUESTION 3:
What ISDN timer is started after Q.931 SETUP msg is sent?
A. T301
B. T303
C. T302
D. T310
E. T305
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Answer: D
If the Call Setup message is not acknowledged before the T303 timer expires, the CPE
sends a second Call Setup message and restart T303. If T303 expires a second time, the
call is cleared and disconnected.
Incorrect Answers:
T301 timer is for “Call Proceeding” not SETUP.
QUESTION 4:
Which statements are true regarding Interworking? Select two.
A. Interworking is only supported in AToM.
B. Interworking is supported in AToM and L2TPv3.
C. Ethernet Interworking is only supported if one AC is Ethernet or VLAN.
D. FR-PPP is not supported.
Answer: B, C
Explanation:
Table1 L2VPN Interworking Supported Features
Feature MPLS or L2TPv3
Support IP or Ethernet Support
Frame Relay to
Ethernet/VLAN MPLS L2TPv3 IP Ethernet
Frame Relay to PPP
MPLS L2TPv3
IP
Frame Relay to ATM AAL5 MPLS IP
Ethernet/VLAN to ATM
AAL5
MPLS
IP Ethernet
Ethernet to VLAN MPLS IP
L2TPv3 Ethernet
http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1838/products_feature_guide09186a008029b264.
html#wp107
Item “C” just means that to support Ethernet one end or the other of the Attachment Circuit has to
be Ethernet. Note that in the third column where “Ethernet” appears, one or the other (or both) in
column 1 is “Ethernet” (or VLAN).
Look for any Transport over MPLS for information on configuring AToM.
For configuring L2VPN Interworking, see L2VPN Interworking.
QUESTION 5:
Observering the output below from the CK router, select what path EoMPLS will take before exiting a
router:
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CK#show mpls 12transport vc 100 detail
Local interface: Fa0/0.1 up, line protocol up, Eth VLAN 100 up
Destination address: 172.0.0.3, VC ID: 100, VC status: up
Preferred path: Tunnel1, active
Default path: disabled
Tunnel label: 3, next hop point2point
Output interface: Tu1, imposed label stack {27 20}
Create time: 00:07:11, last status change time: 00:07:11
Signaling protocol: LDP 16, remote 20
MPLS VC labels: local 16, remote 20
Group ID: local 0, remote 0
MTU: local 1500, remote 1500
Remote interface description:
Sequencing: receive disabled, send disabled
A. 172.0.0.3
B. FastEthernet 0/0
C. FastEthernet 0/0.1
D. Tunnel1
E. This is an invalid output
Answer: D
QUESTION 6:
What is NOT true regarding PW QoS?
A. A policy action can be applied for packets matched by DLCI.
B. LLQ can be applied to traffic classified per COS on Ethernet AC.
C. CB-WFQ can be applied to traffic classified per COS on Ethernet AC.
D. The command ’set cos’ is used to modify the .1p cos bits in a policy.
E. The command ’set vlan’ is used to modify the VLAN tag in a policy.
F. All of the above.
Answer: E
QUESTION 7:
According to the IEEE 802.3 CSMA/CD specification, what is the proper signal for contact 6 of a PHY
without an internal crossover MDI Signal?
A. Receive +
B. Transmit +
C. Receive -
D. Transmit -
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Answer: C
QUESTION 8:
Exhibit:
A router has the above routes listed in its routing table and receives a packet destined for 172.16.0.45.
What will happen?
A. The router will not forward this packet, since it is destined for the 0 subnet.
B. The router will forward the packet through 172.31.116.65, since it has the lowest metric.
C. The router will forward the packet through 10.1.1.1.
D. The router will forward the packet through 172.31.116.65, since it has the lowest administrative distance.
E. The router will forward the packet through 192.168.1.4
Answer: C
Explanation:
The longest mask rule applies here both 172.16.0.0/24 and 172.16.0.0/16 match, but the routing
entry for the /24 is used since the mask is longer.
QUESTION 9:
Which statement is true? Select one.
A. L2TPv2 and L2TPv3 are the same protocol with enhanced features in L2TPv3.
B. L2TPv3 and L2TPv3 are both commonly used for dial-in services.
C. L2TPv2, not L2TPv3, is commonly used for dial-in services.
D. L2TPv3 is used for Layer2 attachment services.
E. None of the above.
Answer: C
l2tpv2 is used normally for dial-in service and remote access see book (Layer 2 VPN Architectures:
chapter2/section3:Layer 2 Tunnel Protocol Version 3 Overview)
Not A: there are some difference between l2tpv2 & l2tpv3 not just extension or enhancement
QUESTION 10:
What is most commonly used to prevent hackers from flooding a port with MAC-addresses?
A. BPDU Guard
B. 802.x
C. Port Security
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D. Storm Control
E. Switch Port protected
Answer: C