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## 2021 Apr 400-101 free practice questions

Q101. Which IPv6 tunneling type establishes a permanent link between IPv6 domains over IPv4?

A. IPv4-compatible tunneling

B. ISATAP tunneling

C. 6to4 tunneling

D. manual tunneling

Explanation:

A manually configured tunnel is equivalent to a permanent link between two IPv6 domains over an IPv4 backbone. The primary use is for stable connections that require regular secure communication between two edge routers or between an end system and an edge router, or for connection to remote IPv6 networks.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/i p6-tunnel.html

Q102. Consider a network that mixes link bandwidths from 128 kb/s to 40 Gb/s. Which value should be set for the OSPF reference bandwidth?

A. Set a value of 128.

B. Set a value of 40000.

C. Set a manual OSPF cost on each interface.

D. Use the default value.

E. Set a value of 40000000.

F. Set a value of 65535.

Explanation:

Unlike the metric in RIP which is determined by hop count and EIGRP’s crazy mathematical formulated metric, OSPF is a little more simple. The default formula to calculate the cost for the OSPF metric is (10^8/BW). By default the metrics reference cost is 100Mbps, so any link that is 100Mbps will have a metric of 1. a T1 interface will have a metric of 64 so in this case if a router is trying to get to a FastEthernet network on a router that is through a T1 the metric would be 65 (64 +1). You do however have the ability to statically specify a metric on a per interface basis by using the ip ospf cost # where the cost is an integer between 1-65535.

So the big question is why would you want to statically configure a metric? The biggest advantage of statically configuring an OSPF metric on an interface is to manipulate which route will be chosen dynamically via OSPF. In a nut shell it’s like statically configuring a dynamic protocol to use a specific route. It should also be used when the interface bandwidths vary greatly (some very low bandwidth interfaces and some very high speed interfaces on the same router).

Q103. Which two statements about the max-age time in IS-IS are true? (Choose two.)

A. The IS-IS max-age time is 20 minutes by default.

B. The IS-IS max-age time is 60 minutes by default.

C. The IS-IS max-age time increments from zero to max-age.

D. The IS-IS max-age time decrements from max-age to zero.

Q104. Which two loop-prevention mechanisms are implemented in BGP? (Choose two.)

A. A route with its own AS in the AS_PATH is dropped automatically if the route reenters its own AS.

B. A route with its own cluster ID in the CLUSTER_LIST is dropped automatically when the route reenters its own AS.

C. The command bgp allowas-in enables a route with its own AS_PATH to be dropped when it reenters its own AS.

D. The command bgp bestpath as-path ignore enables the strict checking of AS_PATH so that they drop routes with their own AS in the AS_PATH.

E. The command bgp bestpath med missing-as-worst assigns the smallest possible MED, which directly prevents a loop.

Explanation:

When dealing with the possibility of routing updates making their way back into an AS, BGP relies on the information in the AS_path for loop detection. An update that tries to make its way back into the AS it was originated from will be dropped by the border router. With the introduction of route reflectors, there is a potential for having routing loops within an AS. A routing update that leaves a cluster might find its way back inside the cluster. Loops inside the AS cannot be detected by the traditional AS_path approach because the routing updates have not left the AS yet. BGP offers two extra measures for loop avoidance inside an AS when route reflectors are configured.

Using an Originator ID

The originator ID is a 4-byte, optional, nontransitive BGP attribute (type code 9) that is created by the route reflector. This attribute carries the router ID of the originator of the route in the local AS. If, because of poor configuration, the update comes back to the originator, the originator ignores it.

Using a Cluster List

The cluster list is an optional, nontransitive BGP attribute (type code 10). Each cluster is represented with a cluster ID.

A cluster list is a sequence of cluster IDs that an update has traversed. When a route reflector sends a route from its clients to nonclients outside the cluster, it appends the local cluster ID to the cluster list. If the route reflector receives an update whose cluster list contains the local cluster ID, the update is ignored. This is basically the same concept as the AS_path list applied between the clusters inside the AS.

Reference: http://borg.uu3.net/cisco/inter_arch/page11.html

Q105. Refer to the exhibit.

What kind of problem is detected?

A. The packet types that are being sent are unknown.

B. The maximum MTU size that can be used is 1492.

C. Waiting for a reply timed out.

D. Fragmentation starts to occur when the MTU of 1472 is reached.

### Most up-to-date 400-101 free draindumps:

Q106. Which two 802.1D port states are expected in a stable Layer 2 network? (Choose two.)

A. forwarding

B. learning

C. listening

D. blocking

E. disabled

Q107. Which two statements about ERSPAN are true? (Choose two.)

A. It supports jumbo frames of up to 9202 bytes.

B. It adds a 50-byte header to copied Layer 2 Ethernet frames.

C. It supports packet fragmentation and reassembles the packets.

D. It adds a 4-byte header to copied Layer 2 Ethernet frames.

E. Source sessions on an individual switch can use different origin IP addresses.

Q108. 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.

Q109. Which three characteristics are shared by subinterfaces and associated EVNs? (Choose three.)

B. routing table

C. forwarding table

D. access control lists

E. NetFlow configuration

Q110. Which two modes of operation does BFD support? (Choose two.)

A. synchronous mode

B. asynchronous mode

C. demand mode

D. echo mode

E. aggressive mode

F. passive mode