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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What CEF optimisation technique cache FIB entries in switch line cards?
Accelerated CEF (aCEF)
Multilayer Switching
Creating the VLAN
Switch(config)#errdisable detect cause vmps

2. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
IEEE 802.3ab
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)

3. What is 1000BASE-X?
Cabling specifications for Gigabit Ethernet
Electromagnetic Interference
Full duplex only
Switch(config)#interface range macro {name}

4. What is the TCAM Value and Mask for an Ethernet access list?
Switch#show adjacency [{interface}] [summary | detail]
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
The CEF entry version number
Switch#show errdisable recovery

5. What is the prerequesite for creating a working SVI?
Switch#show interfaces status err-disabled
10 km
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Creating the VLAN

6. Specifies the timer for automatic re-enabling of error-disabled ports
Tunnel
Switch(config)#errdisable recovery interval {seconds}
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Partition and tune the TCAM on some Catalyst switches into areas for different functions

7. Enables error-disable for errors with dynamic ARP inspection
Store-and-forward
FIB with adjacency table
Switch(config)#errdisable detect cause arp-inspection
Full duplex only

8. Disables a switch port
Switch(config-if)#shutdown
Switch(config)#errdisable detect cause dtp-flap
15 metres
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure

9. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
On
Dynamic
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

10. What is MLS?
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Multilayer Switching
Switch(config-if)#no switchport

11. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Full duplex only
70 km for 9 micron SMF; 100 km for 8 micron SMF
15 metres
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

12. Creates an interface-range macro
By Mask/Value - where each unique mask has eight value patterns associated with it
American National Standards Institute
Switch(config)#errdisable detect cause udld
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

13. What is half duplex operation?

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14. What is the TCAM Value and Mask for an IP access list?
American National Standards Institute
A name assigned to a ranges of interfaces
Only temporarily for debugging purposes
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

15. What are the symptoms of a duplex setting mismatch between two ends of a link?
ANSI X3T11 FibreChannel
Slow response times - low throughput - runts and other input errors on the switch ports
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Creating the VLAN

16. Displays CEF Punt statistics with number of packets and reason for each line card
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
The Layer 3 engine
Switch#show cef not-cef-switched
The Discard adjacency

17. What are the duplex modes of a GigaStack GBIC?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
LAN PHY and WAN PHY
Switch(config)#errdisable detect cause ilpower
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

18. What is 100BASE-T4?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
American National Standards Institute
Switch(config)#no ip cef
Interconnecting switches in a campus network

19. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Numeric values that represent what action to take after the TCAM lookup occurs
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config)#errdisable detect cause bpduguard
Electromagnetic Interference

20. Adds a static entry to the MAC address table
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
A name assigned to a ranges of interfaces
IEEE 802.3ab
A switch port that has been shut down automatically due to a serious error condition

21. What CEF optimisation replicates the entire FIB table among switch line cards?
Distributed CEF (dCEF)
Switch#show ip cef
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

22. What is the maximum cabling distance for 1000BASE-CX?
On
25 metres
10 km
The Null adjacency

23. What is TCAM?
Switch(config)#errdisable detect cause unicast-flood
Institute of Electrical and Electronics Engineers
Switch#show interfaces {interface}
Ternary Content-Addressable Memory

24. What is LAN PHY used for?
Switch(config)#errdisable detect cause security-violation
Institute of Electrical and Electronics Engineers
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Interconnecting switches in a campus network

25. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
XENPAK - X2 - or SFP+
The CEF entry version number
Creating the VLAN
Switch(config)#errdisable detect cause {all | {cause-name}}

26. Creates a switched virtual interface (SVI) and enters interface configuration mode
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config)#mac address-table aging-time {seconds}
Switch(config)#interface vlan {vlan-id}
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

27. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Half duplex

28. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
The CEF entry version number
Switch(config)#errdisable detect cause rootguard
Security and QoS ACLs
Interconnecting switches in a campus network

29. Enables error-disable for conditions that trigger port security configured on a port
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
40 km
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#errdisable detect cause psecure-violation

30. What is the standard for 1000BASE-T?
IEEE 802.3ab
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config-if)#no ip route-cache cef
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)

31. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
1 -2 on one end with 3 -6 on the other end
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
SC or MT-RJ
Creating the VLAN

32. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch(config)#errdisable detect cause psecure-violation
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Off
From 30 seconds to 86 -400 seconds (24 hours)

33. What is CSMA/CD?
Switched virtual interface (SVI)
Carrier Sense Multiple Access Collision Detection
Switch(config-if)#switchport mode access
The Punt adjacency

34. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch(config-if)#switchport access vlan {vlan}
The Layer 3 engine
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config-if)#no switchport

35. What is 1000BASE-T?
SVI or native routed interface
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Security and QoS ACLs
Switch(config)#errdisable detect cause udld

36. Sets the duplex mode of an Ethernet or Fast Ethernet interface
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Switch(config-if)#duplex {auto | full | half}
Static access or dynamic

37. Displays dynamic CAM table entries
CEF glean
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

38. What are the administrative modes of Layer 2 switched interfaces?
The switch port falls back to default setting of half duplex
Trunk or dynamic
Static access - trunk - tunnel or dynamic
Multilayer Switching

39. Removes entries from the CAM table
ANSI X3T11 FibreChannel
XENPAK - X2 - or SFP+
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
LOU registers

40. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
10GbE operates only at full duplex
Switch(config)#interface {type}{module}/{number}
100 metres

41. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
A name assigned to a ranges of interfaces
CEF glean
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Source MAC address; Port of arrival; VLAN; Time stamp

42. What is FIB?
Dynamic
Switch(config)#errdisable detect cause unicast-flood
Forwarding Information Base
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

43. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Tunnel
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Institute of Electrical and Electronics Engineers
Content-Addressable Memory

44. What is 10GBASE-X?
Multilayer Switching
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Cabling specifications for 10 Gigabit Ethernet
Security and QoS ACLs

45. What is 100BASE-FX?
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config)#errdisable detect cause l2ptguard
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Full duplex only

46. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
10 km
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config)#errdisable detect cause pagp-flap

47. What is the operational mode of a switch port that is a member of one VLAN?
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Trunk
Static access

48. What is the TCAM Value and Mask for an IGMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Punt adjacency
With a mask value in addition to binary values to decide which keys in a table are relevant

49. What is 1000BASE-SX?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
IEEE 802.3ae
Switch(config)#interface range macro {name}
Switch(config-if)#description {string}

50. What CEF adjacency is used to switch packets that can't be forwarded normally?
Carrier Sense Multiple Access Collision Detection
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
The Drop adjacency
Down - static access - trunk or tunnel