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2021 Apr 400-101 answers
Q221. Which option is a core event publisher for EEM?
A. Timer
B. Policy Director
C. Applet
D. Script
Answer: A
Explanation:
EEM is a flexible, policy-driven framework that supports in-box monitoring of different components of the system with the help of software agents known as event detectors. The figure below shows the relationship between the EEM server, core event publishers (event detectors), and the event subscribers (policies). Basically, event publishers screen events and publish them when there is a match on an event specification that is provided by the event subscriber. Event detectors notify the EEM server when an event of interest occurs. The EEM policies that are configured using the Cisco command-line interface (CLI) then implement recovery on the basis of the current state of the system and the actions specified in the policy for the given event. EEM offers the ability to monitor events and take informational or corrective action when the monitored events occur or when a threshold is reached. An EEM policy is an entity that defines an event and the actions to be taken when that event occurs. There are two types of EEM policies: an applet or a script. An applet is a simple form of policy that is defined within the CLI configuration. A script is a form of policy that is written in Tool Command Language (Tcl).
Figure 1. Embedded Event Manager Core Event Detectors
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/eem/configuration/15-mt/eem-15-mt-book/eem-overview.html
Q222. In which two modes do IPv6-in-IPv4 tunnels operate? (Choose two.)
A. tunnel mode
B. transport mode
C. 6to4 mode
D. 4to6 mode
E. ISATAP mode
Answer: C,E
Explanation:
*There are 5 tunneling solution in IPv6:*
*1. Using the “Tunnel mode ipv6ip”, in this case the tunnel source and destination are configured with IPv4 addressing and the tunnel interface is configured with IPv6. This will use protocol 41. This is used for IPv6/IPv4.
*
R1(config)#int tunnel 1
R1(config-if)#ipv6 address 12:1:12::1/64
R1(config-if)#tunnel source 10.1.12.1
R1(config-if)#tunnel destination 10.1.12.2
R1(config-if)#*tunnel mode ipv6ip*
*
2. Using the “Tunnel mode gre ipv6, in this case the tunnel source and destination are all configured with IPv6 addressing. This is used for IPv6/IPv6.
*
BB1(config)#int tunnel 1
BB1(config-if)#ipv6 address 121:1:121::111/64
BB1(config-if)#tunnel source 10:1:111::111
BB1(config-if)#tunnel destination 10:1:112::112
BB1(config-if)#*tunnel mode gre ipv6*
*3.
In this case, the third type, the tunnel mode is NOT used at all, note that the tunnel interface is configured with IPv6 and the tunnel source and destination is configured with IPv4 but no mention of tunnel mode. This configuration will use protocol 47. This is used for IPv6/IPv4.
*
R1(config)#int tunnel 13
R1(config-if)#ipv6 address 13:1:13::1/64
R1(config-if)#tunnel source 10.1.13.1
R1(config-if)#tunnel destination 10.1.13.3
*4. Note in this case a special addressing is assigned to the tunnel interface which is a concatenation of a reserved IPv6 address of 2002followed by the translated IPv4 address of a given interface on the router. In this configuration ONLY the tunnel source address is used and since the tunnel is automatic, the destination address is NOT configured. The tunnel mode is set to “Tunnel mode ipv6ip 6to4. Note the IPv4 address of 10.1.1.1 is translated to 0A.01.01.01 and once concatenated, it will be “2002:0A01:0101: or 2002:A01:101. This is used for IPv6/IPv4.
*
R1(config)#interface Tunnel14
R1(config-if)#ipv6 address 2002:A01:101::/128
R1(config-if)#tunnel source 10.1.1.1
R1(config-if)#*tunnel mode ipv6ip 6to4*
*5. ISATAP, ISATAP works like 6to4 tunnels, with one major difference, it uses a special IPv6 address which is formed as follows: *
*In this tunnel mode, the network portion can be any IPv6 address, whereas in 6to4 it had to start with 2002.*
*Note when the IPv6 address is assigned to the tunnel interface, the “eui-64 is used, in this case the host portion of the IPv6 address starts with “0000.5EFE” and then the rest of the host portion is the translated IPv4 address of the tunnel’s source IPv4 address. This translation is performed automatically unlike 6to4. This is used for IPv6/IPv4.*
R4(config)#int tunnel 46
R4(config-if)#ipv6 address 46:1:46::/64 eui-64
R4(config-if)#tunnel source 10.44.44.44
R4(config-if)#*tunnel mode ipv6ip ISATAP*
Q223. How does having an EIGRP feasible successor speed up convergence?
A. EIGRP sends queries only if there is a feasible successor, which decreases the number of routers that are involved in convergence.
B. EIGRP sends queries only if there is not a feasible successor, which causes less control traffic to compete with data.
C. EIGRP immediately installs the loop-free alternative path in the RIB.
D. EIGRP preinstalls the feasible successor in the RIB in all cases, which causes traffic to switch more quickly.
Answer: C
Explanation:
Feasible Successor
. A next-hop router that serves as backup to the current successor.
. The condition is that the said router’s AD (or RD) is less than the FD of the current successor route.
. Once the feasible successor is selected, they are placed in the topology table. If a change in topology occurs which requires a new route, DUAL looks for the feasible successor and uses it as new route immediately, resulting in fast convergence.
Reference: http://routemyworld.com/2008/07/page/2/
Q224. Which two statements about VRRP are true? (Choose two.)
A. It is assigned multicast address 224.0.0.18.
B. The TTL for VRRP packets must be 255.
C. It is assigned multicast address 224.0.0.9.
D. Its IP protocol number is 115.
E. Three versions of the VRRP protocol have been defined.
F. It supports both MD5 and SHA1 authentication.
Answer: A,B
Q225. Which two statements are true about IPv6 multicast? (Choose two.)
A. Receivers interested in IPv6 multicast traffic use IGMPv6 to signal their interest in the IPv6 multicast group.
B. The PIM router with the lowest IPv6 address becomes the DR for the LAN.
C. An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8.
D. The IPv6 all-routers multicast group is FF02:0:0:0:0:0:0:2.
Answer: C,D
Explanation:
Multicast addresses in IPv6 have the prefix ff00::/8.
Well-known IPv6 multicast addresses
Address
Description
ff02::1
All nodes on the local network segment
ff02::2
All routers on the local network segment
Reference: http://en.wikipedia.org/wiki/Multicast_address
Most recent 400-101 answers:
Q226. DRAG DROP
Drag and drop the DMVPN command on the left to the corresponding function on the right.
Answer:
Q227. Which statement describes Cisco PfR link groups?
A. Link groups enable Cisco PfR Fast Reroute when NetFlow is enabled on the external interfaces of the border routers.
B. Link groups define a strict or loose hop-by-hop path pReference:
C. Link groups are required only when Cisco PfR is configured to load-balance all traffic.
D. Link groups are enabled automatically when Cisco PfR is in Fast Reroute mode.
E. Link groups set a preference for primary and fallback (backup) external exit interfaces.
Answer: E
Explanation:
The Performance Routing - Link Groups feature introduced the ability to define a group of exit links as a preferred set of links, or a fallback set of links for PfR to use when optimizing traffic classes specified in an PfR policy. PfR currently selects the best link for a traffic class based on the preferences specified in a policy and the traffic class performance—using parameters such as reachability, delay, loss, jitter or MOS—on a path out of the specified link.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-link-group.html
Q228. DRAG DROP
Drag and drop the argument of the mls ip cef load-sharing command on the left to the function it performs on the right.
Answer:
Q229. Refer to the exhibit.
Which two routes are included in the route update? (Choose two.)
A. 10.3.0.0
B. 10.3.2.0
C. 10.3.4.0
D. 10.3.6.0
E. 10.3.3.0
Answer: C,D
Explanation:
This access list will permit the 10.3.4.0, 10.3.5.0, 10.3.6.0, and 10.3.7.0 subnets.
Q230. Which Cisco IOS VPN technology leverages IPsec, mGRE, dynamic routing protocol, NHRP, and
Cisco Express Forwarding?
A. FlexVPN
B. DMVPN
C. GETVPN
D. Cisco Easy VPN
Answer: B