CCNP: Building Multilayer Switched Networks Chapter 4

Module 4 Exam
Module 4 ‐ 1 ‐
1. What is a primary reason to use a trunk link to connect a switch to an external router
that is providing interVLAN routing?
· fewer router and switch ports are used (*)
· high bandwidth
· ease of MLS integration
· reduction of CPU overhead
· router cpu is well‐matched to the connected switch
2. Which command should be entered to turn a physical switch port/interface into a
Layer 3 port?
· Switch(config‐if)#routerport
· Switch(config‐if)#switchport layer3
· Switch(config‐if)#switchport off
· Switch(config‐if)#no switchport (*)
· Switch(config‐if)#routerport on
3. Which two statements are true about the Forwarding Information Base (FIB) table?
(Choose two.)
· The FIB table uses ACLs to determine matches.
· The FIB table is based on CDP packets received by the router.
· The FIB table is generated from the contents of the routing table. (*)
· The FIB table lookups are performed based on destination MAC address.
· The FIB table will update if an ARP entry for a destination next hop changes. (*)
4. What happens when the CEF TCAM table is full?
· The packet will be dropped.
· The longest match in the table will be used.
· The shortest match in the table will be used.
· A wildcard entry will force the packet to route via the route table. (*)
5. Which three statements regarding switched virtual interfaces (SVI) are true? (Choose
three.)
· A routed port is an alternative to an SVI that is created with the switchport mode
routed interface configuration command.
· An SVI is a virtual Layer 3 interface that can be configured for any VLAN that
exists on a Layer 3 switch. (*)
· An SVI can provide a default gateway for a VLAN so traffic can be routed
between VLANs. (*)
· For redundancy, a VLAN can have more than one SVI associated to it.
· SVIs are created by entering VLAN interface configuration mode and assigning
an IP address. (*)
· SVIs must be explicitly configured for all VLANs.
Module 4 Exam
Module 4 ‐ 2 ‐
6. In which two modes can Cisco Express Forwarding (CEF) operate? (Choose two.)
· central CEF mode (*)
· distributed CEF (dCEF) mode (*)
· enhanced CEF mode
· forwarding CEF (fCEF) mode
· process CEF mode
7. Which two statements referring to CEF tables are true? (Choose two.)
· CEF IP destination prefixes are stored in the TCAM table from the least specific to
the most specific entry.
· The adjacency table is derived from the ARP table, and it contains Layer 2
rewrite (MAC) information for the next hop. (*)
· The Forwarding Information Base (FIB) lookup is based on the Layer 2 destination
MAC addresses.
· The Forwarding Information Base (FIB) is derived from the IP routing table and
is arranged for maximum lookup throughput. (*)
· When the CEF TCAM table is full, a static entry redirects the frame to the Layer 2
engine.
8. CEF is enabled globally. However, for testing purposes, CEF was disabled on interface
GigabitEthernet 0/2. Which command would re‐enable CEF on the interface?
· Switch(config)# ip cef enable
· Switch(config)# ip route‐cache cef
· Switch(config)# ip route‐cef
· Switch(config)# interface gi 0/2
Switch(config‐if)# ip cef enable
· Switch(config)# interface gi 0/2
Switch(config‐if)# ip route‐cache cef (*)
· Switch(config)# interface gi 0/2
Switch(config‐if)# ip route‐cef
Module 4 Exam
Module 4 ‐ 3 ‐
9. Refer to the exhibit. A network administrator attempts to ping 172.16.10.1 from
RouterA. What will the router output be?
· Sending 5, 100‐byte ICMP Echos to 172.16.20.1, timeout is 2 seconds:
!!!!!
· Sending 5, 100‐byte ICMP Echos to 172.16.20.1, timeout is 2 seconds:
..... (*)
· Sending 5, 100‐byte ICMP Echos to 172.16.20.1, timeout is 2 seconds:
U.U.U
· %Unrecognized host or address, or protocol not running
· %Network or host unreachable, TTL exceeded
· %LINEPROTO‐5‐UPDOWN: Line protocol on Interface FastEthernet0/13, changed
state to down
Module 4 Exam
Module 4 ‐ 4 ‐
10. Which statement is true regarding the CEF‐forwarding process?
· The FIB table contains the Layer 2 rewrite information.
· The adjacency table eliminates the need for the ARP protocol.
· After an IP prefix match is made, the process refers to the adjacency table to
determine a Layer 2 next hop address. (*)
· Adjacency table lookups are based upon the closest Layer 3 prefix match.
11. What statement is true regarding TCAM memory in CEF switching?
· TCAM includes only Layer 3 lookup information.
· A single lookup provides Layer 2, Layer 3, and ACL information. (*)
· TCAM lookup tables are only used for the Layer 3 forwarding operation.
· TCAM lookup tables are only used for the rapid processing of ACLs within CEF.
Module 4 Exam
Module 4 ‐ 5 ‐
12. Refer to the exhibit and the partial configuration taken on routers RTA and RTB. All
users can ping their gateways, but users on VLAN 5 and VLAN 10 cannot
communicate with the users on VLAN 20. What should be done to solve the
problem?
· A dynamic routing protocol or static routes should be configured on the routers.
(*)
· A trunk should be configured between routers RTA and RTB.
· RTA’s interface Fa0/1 and RTB’s Fa0/1 should be configured with three
subinterfaces with ISL encapsulation.
· RTA’s interface Fa0/1 and RTB’s Fa0/1 should be configured with three
subinterfaces with 802.1Q encapsulation.
Module 4 Exam
Module 4 ‐ 6 ‐
13. Refer to the exhibit. An administrator wants to ensure that CEF is functioning
properly between Host A and Host B. If the administrator wants to verify the CEF FIB
table entry for the route 10.10.5.0/24 on Sw_MLSA, what should the adjacency IP
address be?
· 10.10.10.2 (*)
· 10.10.10.1
· 10.10.5.1
· 10.10.5.2
14. Which two statements are true regarding routed ports on a multilayer switch?
(Choose two.)
· A routed port behaves like a regular router interface and supports VLAN
subinterfaces.
· A routed port is a physical switchport with Layer 2 capability.
· A routed port is not associated with a particular VLAN. (*)
· To create a routed port requires removal of Layer 2 port functionality with the
no switchport interface configuration command. (*)
· The interface vlan global configuration command is used to create a routed port.
Module 4 Exam
Module 4 ‐ 7 ‐
15. Refer to the exhibit. The router has been properly configured for the trunking
interface. Which statement is true regarding the routing table on the router?
· It will show a next hop address of the switch for both VLANs.
· It will show one trunking route to 10.0.0.0/8.
· It should contain routes to the 10.10.10.0/24 and the 10.10.11.0/24 networks.
(*)
· It will not show routes to either VLAN because the switch is not configured
properly to trunk VLAN 1 and VLAN 2.
· It will not show any routes because the switch port fa0/1 is in access mode.
Module 4 Exam
Module 4 ‐ 8 ‐
16. Refer to the exhibit. Which statement is true regarding the diagram and show ip
route command output?
· The router will not forward packets between workstations because no routing
protocol has been configured.
· The default gateway for hosts on VLAN 10 should be the Fa0/0 IP address of the
router.
· The default gateway for hosts on VLAN 10 should be the Fa0/0.1 IP address of
the router. (*)
· The default gateway for hosts on VLAN 10 should be the Fa0/0.2 IP address of the
router.
· Hosts on VLAN 10 do not need a default gateway since their packets are being
trunked.
17. Refer to the exhibit. Which statement is true about the configuration?
· VLAN subinterfaces can be created for interface VLAN 10.
· A virtual VLAN interface can be created for the default VLAN (VLAN 1) only.
· Interface VLAN 10 will not support routing or bridging function in the system.
· Interface VLAN 10 will support routing or bridging function in the system. (*)
Module 4 Exam
Module 4 ‐ 9 ‐
18. Refer to the exhibit. Switch SW1 is configured for CEF‐based MLS. When Host A
forwards traffic to Host B, which MAC address will be in the Forwarding Information
Base (FIB) table of switch SW1?
· 001c.1ade.aaae
· 000a.22ae.eeef
· 000a.222e.adef
· 000a.222e.adee
· 000a.22ae.adef (*)
19. What are three key requirements for Inter‐VLAN routing when using an external
router? (Choose three.)
· VLAN capable switch (*)
· trunk connection between router and switch (*)
· redundant routers
· virtual router interface
· router (*)
· serial connection between router and switch
Module 4 Exam
Module 4 ‐ 10 ‐
20. Which packets will not be processed by Cisco Express Forwarding (CEF) and must be
processed by the Layer 3 engine? (Choose three.)
· packets destined for a tunnel interface (*)
· packets that use UDP header options
· packets that exceed the maximum transmission unit (MTU) of the output
interface (*)
· packets that use TCP header options
· packets that use IP header options (*)