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2021 Apr 400-101 free practice exam

Q331. On a network using RIPng, the prefix field of a routing table entry has a value of 0:0:0:0:0:0:0:0. What does this value signify? 

A. The next hop address is unknown. 

B. The next hop address is a site-local address. 

C. The neighboring router has IPv6 ND disabled. 

D. The next hop address must be the originator of the route advertisement. 

E. The associated route follows a default route out of the network. 

Answer: E 


Q332. What are two benefits of NVI? (Choose two.) 

A. It provides scalability by maintaining a NAT table on every interface. 

B. It can dynamically create a static route to the NAT pool for translation. 

C. It supports the use of route maps for policy-based NAT. 

D. It supports the use of a single interface for translations. 

E. It injects a route into the existing routing protocol that directs translation to the NAT pool. 

Answer: A,B 


Q333. Which statement describes the effect of the configuration line redistribute maximum-prefix 1500 90 withdraw? 

A. After the 1500th route is redistributed, a warning is posted in the log file and 90 more routes are redistributed before further routes are discarded. 

B. After the 1350th route is redistributed, a warning is posted in the log file until the 1500th route is redistributed, and then further routes are discarded. 

C. After the 1500th route is redistributed, further routes are discarded only if the CPU is above 90%. 

D. The routing protocol receives 1500 routes. After the routing process has redistributed 90% of the routes, the process supernets routes and injects a NULL route to prevent black-hole routing. 

Answer: B 


Q334. Which set of commands conditionally advertises 172.16.0.0/24 as long as 10.10.10.10/32 is in the routing table? 

A) 

B) 

C) 

D) 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer: B 

Explanation: 

Advertise maps are used for conditional routing to advertise specified prefixes if something which is specified in exist map exists. In our question we need to advertise 172.16.0.0/24 if 10.10.10.10/32 exists in the routing table so we have to use commanD. “neighbor x.x.x.x advertise-map <prefix-list of 172.16.0.0/24> exist-map <prefix-list of 10.10.10.10/32>”. Therefore B is correct. 


Q335. What is the maximum number of secondary IP addresses that can be configured on a router interface? 

A. 1 

B. 2 

C. 4 

D. 1024 

E. 65535 

F. no limit to the number of addresses 

Answer: F 

Explanation: 

From “IP Routing Frequently Asked Questions” 

Q. What are the maximum number of secondary IP addesses that can be configured on a router interface? 

.A. There are no limits on configuring secondary IP addresses on a router interface. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/28745-44.html#q21 


Updated 400-101 book:

Q336. Refer to the exhibit. 

Which technology can be used on the switch to enable host A to receive multicast packets for 239.2.2.2 but prevent host B from receiving them? 

A. IGMP filtering 

B. MLD snooping 

C. IGMP snooping 

D. MLD filtering 

Answer: C 

Explanation: 

IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network traffic. The feature allows a network switch to listen in on the IGMP conversation between hosts and routers. By listening to these conversations the switch maintains a map of which links need which IP multicast streams. Multicasts may be filtered from the links which do not need them and thus controls which ports receive specific multicast traffic. 


Q337. Which congestion-avoidance or congestion-management technique can cause global synchronization? 

A. Tail drop 

B. Random early detection 

C. Weighted random early detection 

D. Weighted fair queuing 

Answer: A 

Explanation: 

Tail Drop 

Tail drop treats all traffic equally and does not differentiate between classes of service. Queues fill during periods of congestion. When the output queue is full and tail drop is in effect, packets are dropped until the congestion is eliminated and the queue is no longer full. 

Weighted Random Early Detection 

WRED avoids the globalization problems that occur when tail drop is used as the congestion avoidance mechanism on the router. Global synchronization occurs as waves of congestion crest only to be followed by troughs during which the transmission link is not fully utilized. Global synchronization of TCP hosts, for example, can occur because packets are dropped all at once. Global synchronization manifests when multiple TCP hosts reduce their transmission rates in response to packet dropping, then increase their transmission rates once again when the congestion is reduced. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcfconav.ht ml#wp1002048 


Q338. Which three statements about DMVPN are true? (Choose three.) 

A. It facilitates zero-touch configuration for addition of new spokes. 

B. It supports dynamically addressed spokes using DHCP. 

C. It features automatic IPsec triggering for building an IPsec tunnel. 

D. It requires uses of IPsec to build the DMVPN cloud. 

E. Spokes can build tunnels to other spokes and exchange traffic directly. 

F. It supports server load balancing on the spokes. 

Answer: A,C,E 


Q339. Which two statements are characteristics of Ethernet private LAN circuits? (Choose two.) 

A. They support communication between two or more customer endpoints. 

B. They utilize more than one bridge domain. 

C. They support point-to-multipoint EVC. 

D. They support multipoint-to-multipoint EVC. 

Answer: A,D 

Explanation: 

An Ethernet Private LAN (EPLAN) is a multipoint–to–multipoint EVC. EPLAN is an EVC that supports communication between two or more UNIs. In EPLAN, only one EVC can exist on a port and the port can have only one EFP. 

Reference: https://www.cisco.com/c/en/us/td/docs/optical/cpt/r9_3/configuration/guide/cpt93_configurat ion/cpt93_configuration_chapter_0100.pdf 


Q340. DRAG DROP 

Drag and drop the extended ping command field on the left to its usage on the right. 

Answer: