400-101 Exam Questions - Online Test
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150 Lectures, 20 Hours
Q1. Refer to the exhibit.
You must complete the configuration on R1 so that a maximum of three links can be used and fragmentation is supported.
Which additional configuration accomplishes this task?
A. interface Multilink19
ip address 192.168.1.1 255.255.255.0
ppp multilink
ppp multilink group 19
ppp multilink links minimum 1
ppp multilink links maximum 3
ppp multilink interleave
B. interface Multilink19
ip address 192.168.1.1 255.255.255.0
ppp multilink
ppp multilink group 19
ppp multilink links maximum 3
ppp multilink fragment delay 20
C. interface Multilink19
ip address 192.168.1.1 255.255.255.0
ppp multilink
ppp multilink group 19
ppp multilink links maximum 3
ppp multilink fragment delay 20
ppp multilink interleave
D. interface Multilink19
ip address 192.168.1.1 255.255.255.252
ppp multilink
ppp multilink group 19
ppp multilink links maximum 3
ppp multilink interleave
Answer: A
Explanation:
The “ppp multilink interleave” command is needed to enable link fragmentation and Interleaving (LFI). The Cisco IOS Link Fragmentation and Interleaving (LFI) feature uses Multilink PPP (MLP). MLP provides a method of splitting, recombining, and sequencing datagrams across multiple logical data links. MLP allows packets to be fragmented and the fragments to be sent at the same time over multiple point-to-point links to the same remote address.
ppp multilink links maximum
To limit the maximum number of links that Multilink PPP (MLP) can dial for dynamic allocation, use the ppp multilink links maximum command in interface configuration mode.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcflfi.html
Q2. Which Layer 2 tunneling technique eliminates the need for pseudowires?
A. OTV
B. L2TPv3
C. AToM
D. VPLS
Answer: A
Q3. DRAG DROP
Drag each AF class on the left to its matching DSCP binary value on the right.
Answer:
Q4. Which statement about OTV is true?
A. The overlay interface becomes active only when configuration is complete and it is manually enabled.
B. OTV data groups can operate only in PIM sparse-mode.
C. The overlay interface becomes active immediately when it is configured.
D. The interface facing the OTV groups must be configured with the highest MTU possible.
Answer: A
Explanation:
OTV has the following configuration guidelines and limitations:
. If the same device serves as the default gateway in a VLAN interface and the OTV edge device for the VLANs being extended, configure OTV on a device (VDC or switch) that is separate from the VLAN interfaces (SVIs).
. When possible, we recommend that you use a separate nondefault VDC for OTV to allow for better manageability and maintenance.
. An overlay interface will only be in an up state if the overlay interface configuration is complete and enabled (no shutdown). The join interface has to be in an up state.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nx-os/OTV/config_guide/b_Cisco_Nexus_7000_Series_NX-OS_OTV_Configuration_Guide/basic-otv.html
Q5. Refer to the exhibit.
Which two commands are required on R3 in order for MPLS to function? (Choose two.)
A. mpls ip
B. ip cef
C. mpls label protocol tdp
D. mpls ip propagate-ttl
Answer: A,B
Q6. With AutoInstall, which mechanism allows for automatic addressing of the serial interface using HDLC?
A. ARP
B. BOOTP
C. DHCP
D. SLARP
Answer: D
Q7. Which three features does GETVPN support to improve deployment and scalability? (Choose three.)
A. configuration of multiple key servers to work cooperatively
B. allowing traffic to be discarded until a group member registers successfully
C. local exceptions in the traffic classification ACL
D. GDOI protocol configuration between group members and the key server
E. redundant IPsec tunnels between group members and the key server
F. redundant multicast replication streaming through the use of a bypass tunnel
Answer: A,B,C
Q8. By default, how does a GET VPN group member router handle traffic when it is unable to register to a key server?
A. All traffic is queued until registration is successful or the queue is full.
B. All traffic is forwarded through the router unencrypted.
C. All traffic is forwarded through the router encrypted.
D. All traffic through the router is dropped.
Answer: B
Explanation:
In the basic GETVPN configuration, the traffic passing through group members will be sent in clear until it registers with the Key Server. This is because the crypto ACL is configured on the KS and GM will get that information only after the registration is successful. This means for a short period of time the traffic can go out unencrypted after a GM is booted up or the existing GETVPN session is cleared manually. This mode is called “fail open” and it is the default behavior. This behavior can be turned off by configuring “Fail Close” mode on the GMs.
Reference: http://www.cisco.com/c/en/us/products/collateral/security/group-encrypted-transport-vpn/deployment_guide_c07_554713.html
Q9. Refer to the exhibit.
Which two statements about this route table are true? (Choose two.)
A. The BGP routes are internal.
B. The OSPF routes with the E2 flag retain the same metric as they leave the router.
C. The OSPF routes with the IA flag have their administrative distances incremented as they leave the router.
D. The BGP routes are external.
E. The OSPF routes with the E2 flag have their metrics incremented as they leave the router.
Answer: A,B
Explanation:
IBGP routes have an Administrative distance of 200, while EBGP have an AD of 20. Here we see that the BGP routes have an AD value of 200.
With OSPF, external routes fall under two categories, external type 1 and external type 2.
The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. The metric for E2 routes do not change when advertising to other routers.
Q10. Refer to the exhibit.
Which statement about the configuration is true?
A. This configuration is incorrect because the dialer interface number must be the same as the dialer pool number.
B. This configuration is missing an IP address on the dialer interface.
C. This configuration is incorrect because the MTU must match the ppp-max-payload that is defined.
D. This configuration represents a complete PPPoE client configuration on an Ethernet connection.
Answer: D
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