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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 is the name of a Layer 3 physical interface on a switch?
Switch(config)#errdisable detect cause udld
By Mask/Value - where each unique mask has eight value patterns associated with it
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Native routed interface

2. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
10 km
Switch(config)#errdisable detect cause rootguard
On

3. What happens to subsequent packets destined for FIB entries in CEF glean state?
With a mask value in addition to binary values to decide which keys in a table are relevant
25 metres
They are dropped (ARP throttling)
Creating the VLAN

4. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Creating the VLAN
Switch(config-if)#speed {10 | 100 | 1000 | auto}
300 seconds

5. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
SC or MT-RJ
Static access or trunk
Dynamic
Full duplex

6. What is the operational mode of a switch port that carries traffic for multiple VLANs?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
IEEE 802.3u
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
Trunk

7. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch(config)#errdisable detect cause channel-misconfig
Switch(config)#errdisable detect cause storm-control
Static access or dynamic

8. What is the maximum cabling distance for 10GBASE-ER/EW?
Wide-Wavelength Division Multiplexing
A station must wait its turn to transmit; it can't transmit and receive at the same time
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
40 km

9. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Trunk
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable detect cause dtp-flap
Full duplex only

10. What is WAN PHY used for?
Switch(config-if)#switchport access vlan {vlan}
Switch(config)#errdisable detect cause vmps
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Feature Manager (FM) and Switching Database Manager (SDM)

11. What is full duplex operation?
Institute of Electrical and Electronics Engineers
Switch(config)#errdisable detect cause arp-inspection
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

12. What function is performed by the Feature Manager (FM)?
Static access or dynamic
Compiling Access Control Entries (ACE) into the TCAM table
Security and QoS ACLs
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

13. What is 100BASE-T2?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config-if)#no switchport
The adjacency table

14. What information is stored in TCAM?
IEEE 802.3z
Security and QoS ACLs
Half duplex
Switch#show adjacency [{interface}] [summary | detail]

15. Configures a switch port with a static access VLAN assignment
Switch(config-if)#switchport access vlan {vlan}
Accelerated CEF (aCEF)
Partition and tune the TCAM on some Catalyst switches into areas for different functions
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

16. How does topology based switching work?
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
In TCAM Value entries
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
A station must wait its turn to transmit; it can't transmit and receive at the same time

17. Enables error-disable when a link is seen to be unidirectional
Value - Mask - and Result (VMR)
Switch(config)#errdisable detect cause udld
IEEE 802.3ab
IEEE 802.3

18. What is the TCAM Value and Mask for an IGMP access list?
Only temporarily for debugging purposes
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch#show adjacency [{interface}] [summary | detail]
A station must wait its turn to transmit; it can't transmit and receive at the same time

19. When should CEF be disabled?
Only temporarily for debugging purposes
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch(config)#no ip cef
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

20. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Switch(config)#errdisable detect cause channel-misconfig
The Drop adjacency
SVI

21. What is WWDM?
By Mask/Value - where each unique mask has eight value patterns associated with it
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
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
Wide-Wavelength Division Multiplexing

22. Displays static CAM table entries
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#default interface {interface}
Ternary Content-Addressable Memory
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

23. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
Switch(config)#errdisable detect cause bpduguard
Only temporarily for debugging purposes
LOU registers
The adjacency table

24. What function is performed by the Switching Database Manager (SDM)?
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Full duplex only
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch#show errdisable recovery

25. What is the maximum cabling distance for 1000BASE-LX/LH?
Content-Addressable Memory
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
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

26. What is the role of a Route Processor (RP) in first generation MLS?
Process the first packet in a traffic flow to determine the destination
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#interface {type}{module}/{number}
15 metres

27. What CEF adjacency is used to switch packets destined for the null interface?
The Null adjacency
IEEE 802.3u
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

28. Configures the maximum ageing time for entries in the MAC address table
American National Standards Institute
A name assigned to a ranges of interfaces
Switch(config)#mac address-table aging-time {seconds}
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

29. Resets the configuration of a switch port to its default values
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
25 metres
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config)#default interface {interface}

30. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable detect cause unicast-flood
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
SC or MT-RJ

31. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Switch#show adjacency [{interface}] [summary | detail]
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#errdisable detect cause link-flap

32. What are the default error-disable detection causes?
Enable error-disable for all possible causes
Cisco Express Forwarding
IEEE 802.3ab
LOU registers

33. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Distributed CEF (dCEF)

34. Adds a description to an interface configuration
LOU registers
Switch#show ip cef
CEF glean
Switch(config-if)#description {string}

35. What are the types of layer 3 switched interfaces
Switch(config-if)#description {string}
Switch(config-if)#shutdown
SVI or native routed interface
Switch(config-if)#switchport access vlan {vlan}

36. Enables error-disable for conditions that trigger port security configured on a port
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
SVI or native routed interface
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch(config)#errdisable detect cause psecure-violation

37. What is the default age-out time for stale entries in the CAM table?
Switch#show running-config interface {interface}
70 km for 9 micron SMF; 100 km for 8 micron SMF
300 seconds
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache

38. What tables are maintained by the CEF Layer 3 engine?
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Routing table and ARP table
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
The Punt adjacency

39. What are the common PMD types for 10 Gigabit Ethernet?
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)
When one station transmits at the same time as another on a shared medium
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache

40. What are GigaStack GBICs used for?
SVI or native routed interface
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

41. What is the maximum cabling distance for 1000BASE-CX?
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#errdisable detect cause channel-misconfig
In TCAM Value entries
25 metres

42. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
10GbE operates only at full duplex
Institute of Electrical and Electronics Engineers
Static access or trunk
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

43. Disables a switch port
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config-if)#shutdown
Enable error-disable for all possible causes
Distributed CEF (dCEF)

44. What is Fast EtherChannel (FEC)?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Switch(config)#errdisable detect cause l2ptguard
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Multilayer Switching

45. What is the maximum cabling distance for 10GBASE-CX4?
SVI or native routed interface
They are dropped (ARP throttling)
Only temporarily for debugging purposes
15 metres

46. What is 10GBASE-CX4?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Ternary Content-Addressable Memory
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Tunnel

47. How are ternary combinations implemented?
Distributed CEF (dCEF)
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch(config)#errdisable detect cause unicast-flood
CEF glean

48. What is 1000BASE-T?
Cabling specifications for Gigabit Ethernet
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

49. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
Cisco Express Forwarding
Logical Operation Unit
Slow response times - low throughput - runts and other input errors on the switch ports
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets

50. Disables CEF operation on an interface
300 seconds
Forwarding Information Base
Switch(config-if)#no ip route-cache cef
70 km for 9 micron SMF; 100 km for 8 micron SMF