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Which Cisco IOS XE process administers routing and forwarding?
A. Forwarding manager
B. Interface manager
C. Cisco IOS
D. Host manager
Correct Answer: C Explanation
Some of the processes are listed in the table below:
Which circumstance can cause packet loss due to a microburst?
A. slow convergence
B. a blocked spanning-tree port
C. process switching
D. insufficient buffers
Correct Answer: D Explanation Explanation/Reference:
Micro-bursting is a phenomenon where rapid bursts of data packets are sent in quick succession, leading to periods of full line-rate transmission that can overflow packet buffers of the network stack, both in network endpoints and routers and switches inside the network. Symptoms of micro bursts will manifest in the form of ignores and/ or overruns (also shown as accumulated in “input error” counter within show interface output). This is indicative of receive ring and corresponding packet buffer being overwhelmed due to data bursts coming in over extremely short period of time (microseconds).
Which two statements about proxy ARP are true? (Choose two.)
A. It is supported on networks without ARP.
B. It allows machines to spoof packets.
C. It must be used on a network with the host on a different subnet.
D. It requires larger ARP tables.
E. It reduces the amount of ARP traffic.
Correct Answer: BD Explanation
Disadvantages of Proxy ARP
Hosts have no idea of the physical details of their network and assume it to be a flat network in which they can reach any destination simply by sending an ARP
request. But using ARP for everything has disadvantages. These are some of the disadvantages:
It increases the amount of ARP traffic on your segment.
Hosts need larger ARP tables in order to handle IP-to-MAC address mappings.
Security can be undermined. A machine can claim to be another in order to intercept packets, an act called “spoofing.”
It does not work for networks that do not use ARP for address resolution.
It does not generalize to all network topologies. For example, more than one router that connects two physical networks.
Refer to the exhibit.
Routers R1 and R2 are configured as shown, and traffic from R1 fails to reach host 220.127.116.11. Which action can you take to correct the problem?
A. Ensure that R2 has a default route in its routing table.
B. Change the OSPF area type on R1 and R2.
C. Edit the router configurations so that address 18.104.22.168 is a routable address.
D. Remove the default-information originate command from the OSPF configuration of R2. Correct Answer: A
Not sure that any of these answers are correct, it appears that this configuration is valid for reaching that one specific host IP. Answer A does have a route to that host so it would not need a default route to get to it. Choice B is incorrect as the area types have nothing to do with this. C is incorrect as that IP address is routable, and D is needed so that R1 will have a default route advertised to it from R2 so that it can reach this destination.
Which service is disabled by the no service tcp-small-servers command?
A. the finger service
B. the Telnet service
C. the Maintenance Operation Protocol service
D. the chargen service
Correct Answer: D Explanation
The TCP small servers are:
Echo: Echoes back whatever you type through the telnet x.x.x.x echo command.
Chargen: Generates a stream of ASCII data. Use the telnet x.x.x.x chargen command.
DiscarD. Throws away whatever you type. Use the telnet x.x.x.x discard command.
DaytimE. Returns system date and time, if it is correct. It is correct if you run Network Time Protocol (NTP), or have set the date and time manually from the
exec level. Use the telnet x.x.x.x daytime command.
Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.)
A. the forwarding information base
B. the label forwarding information base
C. the IP routing table
D. the label information table
E. the adjacency table
Correct Answer: AB Explanation
The control plane runs protocols such as OSPF, BGP, STP, LDP. These protocols are needed so that routers and switches know how to forward packets and
The data plane is where the actual forwarding takes place. The data plane is populated based on the protocols running in the control plane. The Forwarding
Information Base (FIB) is used for IP traffic and the Label FIB is used for MPLS.
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