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2021 Apr 400-101 practice question

Q101. DRAG DROP 

Drag and drop the multicast protocol or feature on the left to the correct address space on the right. 

Answer: 


Q102. 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:


Q103. Refer to the exhibit. 

Why is the loopback 0 interface of R4 missing in the routing table of R2? 

A. R2 is configured as a route reflector client. 

B. There is no peering between R2 and R3. 

C. The next hop is not reachable from R2. 

D. The route originated within the same AS. 

Answer:

Explanation: 

In the “show ip bgp” output we see that there is no peering session between R2 and R3. Since R3 is the route reflector here, R3 would reflect routes advertised from R4 to R2, but the peer needs to be established first. 


Q104. Which two statements about HSRP are true? (Choose two.) 

A. Its virtual MAC is 0000.0C07.Acxx. 

B. Its multicast virtual MAC is 0000.5E00.01xx. 

C. Its default configuration allows for pre-emption. 

D. It supports tracking. 

E. It supports unique virtual MAC addresses. 

Answer: A,D 

Explanation: 

Default HSRP Configuration 

Feature 

Default Setting 

HSRP version 

Version 1 

HSRP groups 

None configured 

Standby group number 

Standby MAC address 

System assigned as: 0000.0c07.acXX, where XX is the HSRP group number 

Standby priority 

100 

Standby delay 

0 (no delay) 

Standby track interface priority 

10 

Standby hello time 

3 seconds 

Standby holdtime 

10 seconds 

. The standby track interface configuration command ties the router hot standby priority to the availability of its interfaces and is useful for tracking interfaces that are not configured for HSRP. When a tracked interface fails, the hot standby priority on the device on which tracking has been configured decreases by 10. If an interface is not tracked, its state changes do not affect the hot standby priority of the configured device. For each interface configured for hot standby, you can configure a separate list of interfaces to be tracked. 

. The standby track interface-priority interface configuration command specifies how much to decrement the hot standby priority when a tracked interface goes down. When the interface comes back up, the priority is incremented by the same amount. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/1 2-2_55_se/configuration/guide/3750xscg/swhsrp.html 


Q105. DRAG DROP 

Drag and drop each STP port role on the left to the matching statement on the right. 

Answer: 


Improved 400-101 free exam:

Q106. Which command enables L2 QoS support in all VLANs (including the native VLAN)? 

A. switchport priority extend cos 

B. mls qos trust dscp 

C. mls qos rewrite ip dscp 

D. switchport trunk native vlan tag 

Answer:

Explanation: 

You can enter the switchport trunk native vlan tag command to enable the tagging of native VLAN traffic on a per-port basis. When tagging is enabled, all the packets on the native VLAN are tagged and all incoming untagged data packets are dropped, but untagged control packets are accepted. When tagging is enabled, it will allow for L2 QoS support in all VLANs, including the native VLAN. 


Q107. How many bytes comprise the system ID within an IS-IS NET? 

A. 4 bytes 

B. 6 bytes 

C. 8 bytes 

D. 16 bytes 

E. 20 bytes 

Answer:

Explanation: 

Routers are identified with NETs of 8 to 20 bytes. ISO/IEC 10589 distinguishes only three fields in the NSAP address format: a variable-length area address beginning with a single octet, a system ID, and a 1-byte n-selector. Cisco implements a fixed length of 6 bytes for the system ID, which is like the OSPF router ID. 

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.sh tml 


Q108. Which two statements about IS-IS are true? (Choose two.) 

A. The default hello interval is 10 seconds and the default hold timer is 30 seconds. 

B. The hello interval can be changed on a per-interface basis with the command isis hello-multiplier. 

C. Both routers need to have the same hello intervals and hold timers in order to form IS-IS neighbors. 

D. Both IS-IS routers need to have the same capabilities in the hello packet in order to form neighbors. 

Answer: A,B 

Explanation: 

isis hello-interval 

To specify the length of time between hello packets that the Cisco IOS software sends, use the isis hello-interval command in interface configuration mode. By default, a value three times the hello interval seconds is advertised as the hold time in the hello packets sent. (Change the multiplier of 3 by specifying the isis hello-multiplier command.) With smaller hello intervals, topological changes are detected faster, but there is more routing traffic. The default is 10 seconds. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfisis.ht ml 


Q109. Refer to the exhibit. 

Your organization has two offices, Site 1 and Site 2, which are connected by a provider 

backbone, as shown. Where must you configure an attachment circuit to allow the two sites to connect over a Layer 2 network using L2TPv3? 

A. PE Site 1 Fa1/0 and PE Site 2 Fa0/0 

B. CE Site 1 Fa0/0 and CE Site 2 Fa0/0 

C. PE Site 1 Se0/0 and PE Site 2 Se0/0 

D. CE Site 1 Fa0/0 and PE Site 2 Se0/0 

Answer:


Q110. What are two reasons to define static peers in EIGRP? (Choose two.) 

A. Security requirements do not allow dynamic learning of neighbors. 

B. The link between peers requires multicast packets. 

C. Back-level peers require static definition for successful connection. 

D. The link between peers requires unicast packets. 

Answer: A,D 

Explanation: 

There are two ways we can create EIGRP neighbor relationship: 

+ Use “network ” command. This is the more popular way to create EIGRP neighbor relationship. That router will check which interfaces whose IP addresses belong to the and turn EIGRP on that interface. EIGRP messages are sent via multicast packets. 

+ Use “neighbor” commanD. The interface(s) that have this command applied no longer send or receive EIGRP multicast packets. EIGRP messages are sent via unicast. The router only accepts EIGRP packets from peers that are explicitly configured with a neighbor statement. Consequently, any messages coming from routers without a corresponding neighbor statement are discarded. This helps prevent the insertion of unauthorized routing peers -> A and D are correct.