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Question 11.
A service provider plans to offer Virtual Private LAN Service to a customer who has 10 sites, and the customer edge switches are attached to 8 provider edge switches.
What is the maximum number of pseudo wires that needs to be provisioned throughout the service provider network in order to have full Layer-2 connectivity among all sites?
A. 10
B. 8
C. 28
D. 45
Answer: C
Explanation:
n(n-1)/2 = 8*7/2=28
Question 12.
Which statements are true regarding the ‘preferred-path’ pseudo wire command?
A. It can be used with an interface, an IP address or an access-list.
B. When used with an IP address, the peer is a remote PE loopback.
C. When used with an IP address, the peer is the IGP next hop.
D. There must be an LSP destined to the IP address used.
E. There must be a TE-Tunnel LSP destined to the IP address used.
Answer: D, E
Explanation:
Usage Guidelines The following guidelines provide more information about using this command:
The destination IP address can be different from peer router ID used in LDP. For example, a peer provider edge (PE) router can have multiple loop back IP addresses, which can be reached by different paths, such as a TE tunnel, static IP route or IGP route.
This command is available only if the pseudo wire encapsulation type is MPLS.
Tunnel selection is enabled when you exit from pseudo wire sub mode.
The selected path should be a label switched path (LSP) destined to the peer PE router. (D)
The selected tunnel must be an MPLS traffic engineering tunnel. (E)
If you select a tunnel, the tunnel tail end must be on the remote PE router.
If you specify an IP address, that address must be the IP address of the loop back interface on the remote PE. The address must have a /32 mask.
Reference:
http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1829/products_feature_guide09186a008016102a.html#wp126
Question 13.
The TCP PUSH flag indicates:
A. The data in the TCP receive buffer should be sent to the application listening to this TCP
connection without waiting for further data.
B. Any data being buffered by routers between the source and destination for this connection
should be sent immediately.
C. The sender should make certain its send buffer is pushed into the wire.
D. This session is about to end.
Answer: A
Question 14.
CIDR is primarily used:
A. In BGP only.
B. For classless routing.
C. In OSPF only.
D. In EIGRP only.
Answer: B
Explanation:
CIDR stands for classless inter domain routing. It is used in any classless routing protocol to subnet (to conserve address space) and super net (to reduce the size of the routing table). [Its main application is the Internet which is controlled by BGP4 so I could see an argument for the answer you give.
Question 15.
A service provider offers Virtual Private LAN Service over its MPLS-enabled network.
Currently 6 provider edge switches total are in service. There are 5 customers who subscribed for the service, and every customer has 2 sites attached for every provider edge switch. What is the maximum number of LDP sessions created for pseudo wire signaling throughout the service provider network to have full Layer-2 connectivity among all sites of each customer?
A. 15
B. 30
C. 36
D. 45
Answer: A
n(n-1)/2=6*5/2=15 since LDP is bidirectional
Question 16.
Estimating the MTU for EoMPLS Packets Edge MTU of 1500, Transport header, AToM header present, MPLS label, and stack MPLS label, calculate the core MTU requirements to handle EoMPLS port mode packets.
A. 1518
B. 1520
C. 1524
D. 1526
Answer: D
See Table 7-3@ L2 VPN architectures.
Question 17.
The ATM reference model is composed of which ATM layers? (Multiple answer)
A. ATM layer
B. Physical layer
C. Modular layer
D. ATM adaptation layer
Answer: A, B, D
Question 18.
In MPLS what is an LSP?
A. Label Selection Pair
B. Label Switched Path
C. Lightweight Signaling Protocol
D. Large Sampling Path
Answer: B
Question 19.
Which statements are true regarding default MTU?
A. Ethernet and POS are 1500 bytes.
B. Ethernet, Serial and HSSI are 1500 bytes.
C. HSSI, ATM and POS are 9100 bytes.
D. HSSI, ATM and POS are 4470 bytes.
E. Ethernet and Serial are 1500 bytes
Answer: D, E
Explanation:
http://www.cisco.com/en/US/partner/tech/IT39/IT371/technologies_tech_note09186a00800c8279.shtml#mtu_4470_bytes
FDDI, HSSI, ATM, POS - 4470
Question 20.
In VPLS, the MAC address withdraw is accomplished by means of what protocol?
A. UDP
B. STP
C. BGP
D. PWE3
E. LDP
Answer: E
Explanation
Virtual Private LAN Service Architectures and Operation [Cisco 7600 Series Routers]
http://www.cisco.com/en/US/partner/products/hw/routers/ps368/products_white_paper09186a00801f6084.shtml
Question 21.
For an OC-48 signal (2.5Gb/s), what is the BER (bit error rate) if there is a 1 bit error every four days?
A. 10E-12
B. 10E-13
C. 10E-14
D. 10E-15
E. 10E-16
Answer: D
Explanation:
BER = Errors/Total Number of Bits
1/2.5*1000*1000*1000*60*60*24*4 = 10E-15
Question 22.
MPLS Traffic Engineering does NOT require:
A. BGP
B. Link state IGP protocol
C. CEF switching
D. RSVP
Answer: A
Explanation:
There are two type of TE
RSVP-TE (widely used) & CR-LDP
(MPLS need CEF switching(C) and TE needs Link state IGP protocol "ISIS/OSPF" (B). However, BGP is not needed for Both basic MPLS nor TE.
Question 23.
What is NOT a reason to deploy MPLS?
A. Ubiquitous acceptance and firm standards.
B. Traffic engineering capabilities.
C. Simplify lookups in software-based routers.
D. Potential use in VPN services.
Answer: A
Question 24.
A router is set to boot from flash, but cannot find boot commands in the configuration.
Also, valid files do not exist in the default flash device. The router will:
A. Boot from ROM, since there are no valid sources.
B. Try to boot from the network, using a default filename.
C. Terminate the boot process with an error message.
D. Try to boot from the network, then boot from ROM as a backup.
Answer: D
Question 25.
What is true about the DLCI field in the Frame Relay header?
A. It consists of two portions, source and destination, which map data to a logical channel.
B. It generally has significance only between the local switch and the DTE device.
C. It is an optional field in the ITU-T specification.
D. It is present only in data frames sent through the network.
Answer: B
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